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ARMORTHANE PROTECTING YOUR WORLD

PROTECTING YOUR WORLD

ARMORTHANE PROTECTING YOUR WORLD

Polyurea vs
Polyaspartic:
What's Different

Polyaspartic is a polyurea, slowed down so a crew can roll it. We make both, so here’s the data-sheet comparison, a label decoder, a working-time planner and a tool that tells you which your job needs.
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  • Garage, shop and commercial floors
  • Pool decks, balconies, roofs and truck beds
  • Chemistry, mils and data sheet on the quote
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Step 1 of 3
4–20 sec
Spray polyurea gel time
Three data sheets, at the gun
14–120 min
Polyaspartic working time
One product, by grade and humidity
250–400%
Spray polyurea elongation
vs 2.4–50% for four polyaspartics
10–16 mils
Polyaspartic per pass, wet
vs a 30+ mil spray polyurea minimum

Polyurea and polyaspartic get sold as rivals. They're relatives. Polyaspartic is a polyurea that's been slowed down on purpose so a crew can roll it, and that one change in speed explains nearly every other difference between them.

Quick answer

Polyaspartic is a type of polyurea: an aliphatic polyurea made with a slow-reacting amine called a polyaspartic ester. Conventional spray polyurea gels in 4–20 seconds, goes on 30 mils thick and up through a heated plural-component rig, and stretches 250–400%. Polyaspartic gives a crew roughly 15 minutes to 2 hours to work, rolls on 10–16 wet mils per coat, holds its color in sunlight, and is harder but far less stretchy (2.4–50% on the sheets we checked). Choose spray polyurea for waterproofing, moving cracks, truck beds and containment. Choose polyaspartic for decorative, sunlit floors. Stack them when you need both. Decode your quote or find the right one for your job.

Most of what ranks for this question is written by installers selling one system, and it shows: "four times stronger," "cures in seconds," "installs at 40 below," and not one data sheet in sight. A garage owner comparing two quotes, one for a "polyurea floor" and one for a "polyaspartic floor," can't tell from those pages whether they're even being offered different things. Often they aren't.

We make both chemistries in Springfield, Missouri: spray polyureas for liners, decks, roofs and containment, and ArmorFloor, an aliphatic polyaspartic for floors. So this page puts published data sheets side by side with the test method named, gives you four tools to check your own job, and says plainly where each one is the wrong choice. Ours included.

What's in this guide
  1. 1Is polyaspartic the same as polyurea?
  2. 2Polyurea vs polyaspartic at a glance
  3. 3Why a "polyurea floor" is usually polyaspartic (label decoder)
  4. 4Cure speed, pot life and working time (planner)
  5. 5Does polyurea yellow? UV compared
  6. 6Thickness, flexibility and wear: the data sheets
  7. 7Spray vs roll: equipment, crew and prep (material calculator)
  8. 8Moisture, temperature and humidity
  9. 9Where each one wins (which-one-fits tool)
  10. 10Polyurea base, polyaspartic top: the hybrid
  11. 11Polyurea vs polyaspartic cost
  12. 12Safety, odor and VOCs
  13. 13Where ArmorThane fits
  14. 14Polyurea vs polyaspartic FAQ
The chemistry

Is polyaspartic the same as polyurea?

In chemistry, yes. In practice, no. Polyurea is what forms when an isocyanate reacts with an amine. Polyaspartic uses a special amine, a polyaspartic ester, whose bulky side groups slow that reaction from seconds to minutes. The film is still a polyurea, an aliphatic one, but it's mixed, applied, built and priced like a different product.

The polyurea family tree

Wikipedia's definition of polyurea is plain: the reaction product "of an isocyanate component and an amine component," where the isocyanate "can be aromatic or aliphatic." Polyaspartic esters are made by reacting an amine with a dialkyl maleate, which "introduces bulky groups to the molecule which causes steric hindrance, slowing the reaction down." The result, in the same article's words, is "a modified polyurea." Here's how the family sorts out on a job site.

TypeIsocyanateAmine sideReaction speedApplied withIn sunlight
Aromatic spray polyureaAromatic (MDI)Amine-terminated resins and chain extendersGels in 4–9 s (Polyeuro 5502, Rhino Extreme HP 11-50)Heated plural-component spray onlyAmbers or darkens; properties unaffected
Aliphatic spray polyureaAliphaticAmine-terminated resinsGels in 10–20 s (Polyeuro 7502)Heated plural-component spray onlyColor-stable
Polyaspartic (aliphatic polyurea)Aliphatic polyisocyanatePolyaspartic ester (hindered amine)Pot life about 30 min typical (Covestro); 14 min–2 h by product and humiditySqueegee and roller, brush, airless or cup gunColor-stable
Hybrid polyureaAromatic or aliphaticAmines blended with polyolsSecondsPlural-component sprayDepends on the isocyanate
Polyurethane (for reference)Aromatic or aliphaticPolyols, not aminesMinutes to hoursSpray or rollDepends on the isocyanate
Sources: Wikipedia (polyurea; polyaspartic esters); Covestro polyaspartics brochure; Polycoat Polyeuro 5502 and 7502 and Rhino Extreme HP 11-50 data sheets; ArmorThane polyurea guide.

Polyaspartic esters came out of patents issued to Bayer in Germany and Miles Corporation in the U.S. in the early 1990s. Covestro, the company that grew out of Bayer's materials business, describes them as "sterically hindered secondary diamines" and pitches polyaspartic coatings as "a logical supplement to fast-setting polyurea technology." A supplement, not a replacement. Keep that in mind and the rest of this page makes sense.

Pure, hybrid, aromatic, aliphatic: four words worth knowing

  • Pure polyurea: "only two basic components," an isocyanate and an amine resin blend, per our polyurea guide. The stretchy, fast-set, spray-only material most people picture.
  • Hybrid polyurea: the resin side blends in polyols (polyurethane chemistry) or other materials. Properties vary widely, so read the data sheet.
  • Aromatic: MDI-based, the workhorse. Tough, chemical resistant and cheaper, but it ambers in sunlight. More in what aromatic polyurea is.
  • Aliphatic: light-stable. Spray aliphatic polyureas and polyaspartic floor coatings fall here. Covestro's description is that aspartics "react with aliphatic polyisocyanates to form polyaspartics."

So "polyaspartic polyurea," a phrase you'll see on kits and quotes, is accurate. It just doesn't tell you whether anything on your floor was sprayed.

Side by side

Polyurea vs polyaspartic at a glance

Spray polyurea is the thick, stretchy, fast-set membrane that needs a rig. Polyaspartic is the thin, hard, UV-stable coat a roller crew can install. The ranges below come from seven published data sheets (three spray polyureas, four polyaspartics) plus our own product pages; each row names its source in the caption.

PropertySpray polyureaPolyaspartic
What it isIsocyanate + amine resin; aromatic or aliphaticAliphatic isocyanate + polyaspartic ester; an aliphatic polyurea
Gel or working timeGel 4–20 s; tack-free 10 s to 3 minWorking time about 15 min to 2 h; tack-free 40 min to 10.5 h
Where it's mixedAt the gun, by a heated proportionerIn a bucket with a drill, usually 1:1 by volume
Applied withImpingement spray gunSqueegee and roller; brush; airless or cup gun
Thickness per pass20–80 mils10–16 wet mils (one product); lifts of 10–12 mils max (another)
Typical total30 mils minimum, up to "unlimited"15–20 mils with flake; over 50 mils nominal with ¼ in. chip
Elongation250–450%2.4–50%
HardnessShore D about 50Shore D 65–86, or pencil 2H
SunlightAromatic ambers; aliphatic holds colorHolds color and gloss
Coldest applicationSubstrate to −20°F (two sheets)30–40°F (four sheets)
Humid air"Relatively insensitive"Speeds cure, shortens pot life, can haze
Foot traffic1–4 h2–4 h up to 30+ h, by grade
Solids and VOC100% solids81–93% solids; under 50 to under 160 g/L VOC
Contractor equipment$15,000–$35,000 entry packages; $80,000–$200,000+ trailer rigsHand tools; both need a grinder for prep
Best atWaterproofing, movement, impact, beds, tanks, roofsDecorative floors, UV-stable topcoats, clear coats
Sources: Rhino Extreme HP 11-50, Polyeuro 5502 and 7502 (spray polyurea); RhinoSeal PA, Simiron Polyaspartic HS, Deco-Crete Polyaspartic 90 and Aspartic 85 (polyaspartic); per-pass range, equipment costs and AquaSafe's 450% from ArmorThane's polyurea guide, polyurea equipment guide and product pages. One product per data point, so check yours.
Interactive tool 1 of 4

Why a "polyurea floor" is usually polyaspartic

Because nobody sprays a membrane on most garage floors. The one-day floors sold as "polyurea" are nearly always a rolled base, a flake broadcast and a polyaspartic topcoat. The word isn't wrong, since polyaspartic is a polyurea, but it hides the question that matters: was any coat sprayed through a plural-component rig?

What's actually in a one-day "polyurea" floor

One manufacturer's "1-Day Polyurea" system guide spells it out. The "Polyurea Medium Basecoat" is mixed two parts base to one part activator, rolled at 6–8 mils, with a warning not to mix "more material than can be applied and broadcasted in 15 minutes." A ¼-inch vinyl chip goes into it at 6 square feet per pound, then a polyaspartic topcoat goes on at 10–16 wet mils. Nominal system thickness: over 50 mils, most of it chip.

That's a good floor. It isn't a sprayed polyurea membrane, and the same guide warns the basecoat will "swell/raise due to foam formation" if it's poured thicker than 200 square feet per gallon. Nothing about it will stretch 400% over a moving crack.

The quote to questionBe wary of any bid that promises polyurea's stretch and polyaspartic's roll-on convenience in the same coat. Among the data sheets we read, the products that stretch 250–400% are sprayed at 30 mils and up, and the ones that roll on stretch 50% or less. Ask which layer does which job.

Read the data sheet in 60 seconds

  • Gel time in seconds or pot life in minutes? Seconds means a rig. Minutes means a bucket.
  • Mils per coat. Over about 20 mils per pass is spray territory; 10–16 wet mils is polyaspartic.
  • Elongation (ASTM D412 or D2370). Hundreds of percent is an elastomer; single or low double digits is a hard coat.
  • Aromatic or aliphatic. Decides whether it yellows outdoors.
  • Solids and VOC. Spray polyureas we checked are 100% solids; polyaspartics ranged 81–93%.
  • Moisture limit. An ASTM F1869 or F2170 number, not "moisture tolerant."

Brand names like "polycuramine" aren't chemistry; our polyaspartic floor coating guide decodes the common ones. Or answer what you know below.

Label decoder

Is my "polyurea" coating really polyaspartic?

Use your quote, the product label or the data sheet. "Don't know" is fine; the more you fill in, the surer the answer.

Most likely: Polyaspartic (an aliphatic polyurea)High confidence
What that means

Polyaspartic (an aliphatic polyurea)

Called polyurea, behaves like polyaspartic. That’s common and not a trick: polyaspartic is a polyurea. What changes is thickness, stretch and how it went down. Mixed in a bucket and rolled or squeegeed, sometimes sprayed. Minutes of working time, thin coats (10–16 wet mils per pass on the sheets we checked), hard and UV-stable, with low stretch (2.4–50% elongation). This is what most one-day and “polyurea” garage floors are.

Ask your installer

Six questions that settle it

  • Can I see the technical data sheet (TDS) for every coat?
  • Is each coat sprayed with a plural-component rig, or mixed and rolled?
  • Aromatic or aliphatic isocyanate on the top coat?
  • How many mils per coat and in total, and is that wet or dry?
  • Gel time or pot life, and elongation (ASTM D412) of the base coat?
  • Which moisture test (ASTM F1869 or F2170), and what limit?
How the clues scored
Polyaspartic (an aliphatic polyurea)
11 pts
Spray polyurea, aromatic
0 pts
Spray polyurea, aliphatic
0 pts
Hybrid polyurea (polyurea–polyurethane blend)
0 pts
A slow-cure coating that isn’t a polyurea
5 pts

Points come from data-sheet traits: spray polyureas gel in 4–20 seconds and go on 30+ mils thick; polyaspartics give 14 minutes to 2 hours and 10–16 wet mils per pass; floor polyaspartics use aliphatic isocyanates. A screening aid, not a lab test.

Interactive tool 2 of 4

Cure speed, pot life and working time

Spray polyurea gels in 4 to 20 seconds and takes foot traffic in 1–4 hours. Polyaspartic gives a crew roughly 15 minutes to 2 hours of working time, set by the grade and the humidity, and takes foot traffic anywhere from 2 hours to a day and a half. Both are fast next to epoxy. Neither is instant on a floor.

Seconds: why pure polyurea needs a rig

The two sides react so fast they can't be premixed. Wikipedia's polyaspartic article puts it bluntly: pure polyurea "reacts extremely quickly making them almost unusable without plural component spray equipment." A proportioner heats both sides, pumps them to pressure and meets them in the gun's mixing chamber. Our polyurea guide says the components must be mixed "about 60 seconds or less" before they hit the surface, which is why the mixing happens at the nozzle.

Speed has a flip side. There's no pot life to manage, but there's also no time to fix a mistake, and the next pass has to land inside the recoat window: 0–6 hours on Polyeuro 5502, 4 hours or less on Rhino Extreme HP 11-50.

Minutes: why humidity runs the polyaspartic clock

Polyaspartic cure is driven by temperature and moisture in the air. Dr. Jeffrey Dormish, writing in Adhesives & Sealants Industry, notes the rate "is also greatly accelerated with increasing humidity," and places its reactivity between polyurea's and polyurethane's. Simiron's published table for its Polyaspartic HS shows how much:

Grade (72°F)Working time, 20% RHWorking time, 80% RHTack-free, 20% RHTack-free, 80% RHFoot trafficHeavy traffic
Xtra Slow2 h70 min10.5 h6.5 h30–34 h3 days
Slow70 min28 min6.5 h3.75 h17–20 h24 h
Medium32 min17 min3.5 h90 min10–12 h24 h
Fast25 min14 min110 min40 min4–6 h24 h
Simiron Polyaspartic HS product data sheet (04/01/2026). Traffic times "assume a temperature of at least 72F and a humidity of at least 50%." Our reading: at 80% RH, working time is 40–58% of the 20% RH figure.

Humid air can cut a crew's working time roughly in half. The same sheet says dip-and-roll application can "almost double the work time," that there should be no more than 5–10 minutes between mixes to avoid tie-in lines, and that going on too thick "may leave a white, hazy appearance." RhinoSeal PA's sheet adds: "Do not mix below the dew point, which will shorten the pot life," and warns that high humidity or low temperature "can cause haziness and blushing."

The planner below works out the dew point, checks both chemistries against published temperature limits, and sizes a safe batch for your crew.

Working-time & install-window planner

Can we coat today, and how much can we mix at once?

Measure the slab with an infrared thermometer, not the air. Working times come from one published polyaspartic table at 72°F, so treat hot-day results as best case.

Your number; time a test batch
100–160 at 10–16 wet mils
52.3°F
Dew point
+15.7°F
Slab above dew point (need 5°F)
49 min
Working time at your RH
6.3 gal
Per batch (≈817 sq ft)

Slow grade Working time about 49 min, tack-free about 5 h 8 min. Plan each batch to be placed in two-thirds of the working time (our margin): 25 sq ft/min x 33 min = 817 sq ft, or 6.3 gal at 130 sq ft/gal. Keep no more than 5–10 minutes between mixes to avoid tie-in lines; dip-and-roll can almost double work time (both Simiron).

Go

Rolled polyaspartic today

  • Slab is 15.7°F above the 52.3°F dew point, past the 5°F minimum.
Go

Spray polyurea today

  • Rhino Extreme HP 11-50 lists a −20°F to 120°F substrate range and Polyeuro 5502 says it’s suitable down to −20°F, so temperature is rarely the limit for a heated rig.
  • Gel time is 4–20 seconds (three data sheets), so there’s no batch to plan. The rig mixes at the gun.
All four grades at 50% RH
GradeWorking timeTack-freeFoot trafficHeavy traffic
Xtra Slow1 h 35 min8 h 30 min30–34 h3 days
Slow ◀49 min5 h 8 min17–20 h24 h
Medium25 min2 h 30 min10–12 h24 h
Fast20 min75 min4–6 h24 h

Simiron Polyaspartic HS data sheet, measured at 72°F; values between 20% and 80% RH are interpolated by us. Traffic times assume at least 72°F and 50% RH during cure. Other polyaspartics differ, so use your product’s sheet.

How we calculated this: dew point by the Magnus formula (b = 17.62, c = 243.12°C); working and tack-free times interpolated linearly between Simiron's 20% and 80% RH values; batch = spread rate x two-thirds of the working time (our planning margin) ÷ coverage. Temperature limits from Simiron HS (35–85°F; Fast grade below 60°F), RhinoSeal PA (40–120°F), Rhino Extreme HP 11-50 (substrate −20°F to 120°F) and Polyeuro 5502 (down to −20°F).

When can you walk on it, park on it, and spill on it?

ProductTypeFoot trafficVehicles or heavy trafficFull cure
Polyeuro 5502Aromatic spray polyurea1–4 hFull service after 24+ h—
Polyeuro 7502Aliphatic spray polyurea2–4 hFull service after 24+ h—
Rhino Extreme HP 11-50Aromatic spray polyurea——95–99% in 24 h
RhinoSeal PAPolyaspartic2–4 h24 h4–7 days
Simiron Polyaspartic HSPolyaspartic4–6 h (Fast) to 30–34 h (Xtra Slow)24 h to 3 daysChemical tests after 5+ days
Deco-Crete Polyaspartic 90Polyaspartic24 h7 days—
From each product's data sheet at its stated test conditions. Cooler, drier air stretches every polyaspartic number.
Sunlight

Does polyurea yellow? UV stability compared

Aromatic polyurea does. Aliphatic polyurea and polyaspartic hold their color. Rhino's aromatic sheet says its polyurea "will tend to yellow or darken in exterior UV exposure, but this will not affect performance." Polycoat's aromatic 5502 records "no cracking or blistering" but "color change, gloss reduction & chalking" after 3,000 hours in a QUV weatherometer, while its aliphatic 7502 claims "excellent color retention."

The color shift is cosmetic. Our polyurea guide says aromatic polyurea yellows "without degrading its physical properties," and that's why most truck beds, tank linings and containment pits are sprayed with aromatic material: it's tougher per dollar and nobody's looking at the color. When the surface is in the sun and the look matters, there are three ways to handle it:

Option 1

Aromatic base, UV-stable top

The approach we recommend on our aromatic polyurea page: tough, affordable aromatic underneath, a light-stable layer on top. Our HighLine 510 page says it "can be modified for outdoor applications" with a UV topcoat.

Option 2

Aliphatic spray polyurea

Color-stable all the way through, like HighLine 410 or ArmorFlex UV. The catch is price: our polyurea guide says aliphatic "can cost more than double" aromatic.

Option 3

Polyaspartic topcoat

Aliphatic by design. Simiron's Polyaspartic HS kept 87–89 gloss units after 1,000 hours of QUV (ASTM G154), from a starting gloss of 92–95. Rolled in thin coats over a base.

One caution on the other side. "Never yellows" and "100% UV stable" are marketing absolutes. A 1,000-hour QUV run is a useful lab comparison, not a 20-year field record, and we didn't find an independent long-term field study that ranks aliphatic polyurea against polyaspartic outdoors. Both are the right family for sun. Epoxy isn't; our polyaspartic vs epoxy comparison covers why.

The data sheets

Thickness, flexibility and wear: what the data sheets show

Spray polyurea is the thick, stretchy one: 250–400% elongation at about Shore D 50, built from 30 mils up. Polyaspartic is the thin, hard one: Shore D 65–86 or pencil 2H and 3,500–6,500 psi tensile, but just 2.4–50% elongation. On the same Taber abrasion test, the spray polyureas lost 6–33 mg and two polyaspartics lost 30 mg.

ProductTypeGel / pot lifePer passElongation %Tensile psiHardnessTaber mgSun
Rhino Extreme HP 11-50Aromatic spray polyurea7–9 s gel30 mils min.; 62.5 typical2502,800–3,200Shore D 50 ± 511Yellows
Polyeuro 5502Aromatic spray polyurea4–8 s1 mm (39 mils) min.400 ± 503,000 ± 200Shore D 50 ± 56 maxChalks in QUV
Polyeuro 7502Aliphatic spray polyurea10–20 sOver 2 mm recommended300 ± 503,300 ± 200Shore D 50 ± 533 maxHolds color
AquaSafe (ArmorThane)Aromatic pure polyureaTack-free under 45 s—Up to 450———Aromatic
RhinoSeal PAPolyaspartic20–30 min10–12 mils max.506,500Pencil 2H30Non-yellowing
Simiron Polyaspartic HSPolyaspartic14 min–2 h10–16 wet mils5–104,000Shore D 70 → 863087–89 gloss, 1,000 h QUV
Deco-Crete Polyaspartic 90Polyaspartic15–20 min6–10 wet mils404,000——UV stable
Aspartic 85Polyaspartic (interior, over epoxy)15–20 min—2.4Over 3,900Shore D 8020 at 500 cyclesUV stable
ArmorFloor TopCoat (ArmorThane)Polyaspartic—14 ± 2 mils dryNot published3,500 ± 300Shore D 65 ± 5—Aliphatic
Taber: ASTM D4060, CS-17 wheel, 1,000 g, 1,000 cycles unless noted; lower is better. Elongation and tensile: ASTM D412 (D2370 for Simiron). Rhino's physical tests were run on 125-mil stock, RhinoSeal's on 5–6-mil films, so treat cross-product comparisons as directional. Click Elongation, Tensile or Taber to sort.

Elongation: the number that decides waterproofing

A coating that stretches 300% can ride over a crack that opens and closes. One that stretches 5–10% can't; it cracks with the slab. Polyeuro 5502 passes the ASTM C1305 crack-bridging test at −15°F. Simiron's polyaspartic sheet, by contrast, is candid that "moving joints and shrinkage cracks may reflect through system." That's not a defect. It's what a hard, thin wear coat does, and it's why a deck over a bedroom or a secondary containment pit gets a sprayed membrane.

You'll see 100%-plus, even 400%, quoted for polyaspartic online. None of the four polyaspartic data sheets we checked comes close; the highest is RhinoSeal PA at 50%. If a bid depends on a polyaspartic stretching, ask for the sheet.

Hardness and tensile: why polyaspartic makes the better wear face

Polyaspartic films are harder (Shore D 70 at 24 hours climbing to 86 at 5 days on the Simiron sheet) and stronger in tension, which is why they take a high gloss, clean up easily and hold decorative chip or quartz. Spray polyurea at Shore D 50 is softer and tougher: it absorbs impact and flexes instead of scratching crisply. Hardness isn't toughness, and neither number alone predicts how a floor wears.

Abrasion: closer than the marketing says

On the same Taber setup, the aromatic spray polyureas lost 6 and 11 mg, the aliphatic one 33 mg, and two polyaspartics 30 mg each. Different labs, film thicknesses and cure schedules make those directional, not a ranking. The honest reading is that both chemistries are wear-resistant, and the thicker film usually lasts longer simply because there's more of it to wear through.

Interactive tool 3 of 4

Spray vs roll: equipment, crew and prep

Spray polyurea needs a heated, high-pressure plural-component proportioner, heated hoses and an impingement gun; the data sheets we read call for about 2,000–2,300 psi and 140–160°F. Polyaspartic needs a drill, a mixing paddle, squeegees, rollers and spiked shoes. Both need a grinder or shot blaster and a clean, dry, profiled slab.

What a spray polyurea job takes

Rhino lists a Graco Reactor at 2,300 psi static with the iso at 140–160°F; Polycoat sprayed its test samples at 2,000 psi minimum and 150–160°F. Our polyurea equipment guide puts pure polyurea at 2,000–3,000 psi, with entry-level electric packages at $15,000–$35,000 and production hydraulic rigs on trailers at $80,000–$200,000 or more.

What you get for that: 20–80 mils in a pass, a seamless membrane on walls, ceilings and odd shapes, and material bought by the drum set (one 55-gallon drum of each side). What you give up: masking for overspray, a trained sprayer, and full protective gear.

Can you roll polyurea? Not conventional pure polyurea; it gels before a roller could move it. Products sold as roll-on "polyurea" use slower chemistry, usually polyaspartic or a blend, so check the sheet.

Applicator in a protective suit and full-face respirator spraying white polyurea from a plural-component gun with heated hoses
A plural-component spray gun: both sides arrive heated and meet at the nozzle.
Installer in spiked shoes spreading a wet floor coating with a flat squeegee
Rolled systems go down with squeegees, rollers and spiked shoes.

What a polyaspartic crew takes

Simiron's system guide lists a drill and Jiffy-style mixing blade, flat and notched EPDM squeegees, non-shedding ⅜-inch nap rollers, edge rollers, spiked shoes and measuring containers. Mix at low speed; our ArmorFloor instructions warn that whipping air in "may result in pinhole blisters and/or shortened pot life." Crews batch, pour, squeegee and back-roll, with no more than 5–10 minutes between batches.

Can you spray polyaspartic? Yes. Covestro mentions roller or single-component airless application, and our ArmorFloor goes on by phenolic roller, high-pressure spray or cup gun at 5 mils minimum ("For best results, use an airless sprayer"). It's still premixed with a working window, not impingement-mixed at the gun.

Prep is the same job either way

Coatings fail at the bond far more often than in the film. RhinoSeal PA calls for shot blasting or diamond grinding to CSP 2 to CSP 5; Simiron's flake system wants CSP 3 or better, new concrete cured at least 28 days, sealers removed and moving joints honored. Spray polyurea over concrete is normally primed; Polycoat's adhesion numbers are for "shot blasted and primed" concrete. The step-by-step lives in our polyaspartic floor coating guide.

Thickness is where the material bill splits. The calculator below compares a sprayed membrane, a hybrid, a flake system and a plain polyaspartic coat for the same floor.

Film-build & material calculator

How much material, how many coats, how thick?

Theoretical coverage from the thickness you pick. For contractors bidding a job, or owners checking what a quote's "mils" really mean.

Membrane or base; 100% solids
10–16 is typical
Sheets we read: 81–93%
6.5 gal
Mixed material, all coats
3 kits + 3 boxes
2-gal top kits + 40-lb chip
18 mils
Coating film, dry (excl. chip)
2 coats + chip
Coats or passes

Chip at full broadcast: 6 sq ft per lb, so a 40-lb box covers 240 sq ft (Simiron). The chip layer is why the finished system measures over 50 mils nominal.
Gallons = area x wet mils ÷ 1,604 x (1 + 10% loss). Dry mils = wet mils x 90% solids for polyaspartic; spray polyurea is 100% solids, so wet = dry. A drum set is 55 gal of A plus 55 gal of B.

System (500 sq ft)Mixed materialPackagingCoating filmCoatsWalk on
Spray polyurea membrane20.6 gal0.19 sets60 mils1–3 passes1–4 h (Polyeuro 5502)
Polyurea base + polyaspartic top24.7 gal0.19 sets + 3 x 2-gal top kits71 milsbase + 1 topAfter the topcoat’s cure
Rolled flake system ◀6.5 gal2.4 gal base + 3 x 2-gal top kits + 3 chip boxes18 mils2 coats + chipNext day (Simiron Slow: 17–20 h)
Polyaspartic, no chip4.1 gal3 x 2-gal kits11 mils1 coat2–4 h (RhinoSeal PA)

Film thickness excludes the chip. Theoretical yields; porous concrete drinks more on the first coat. Walk-on times are from the named data sheets at their test conditions.

How we calculated this: one U.S. gallon spread 1 mil thick covers 1,604 sq ft (231 cubic inches ÷ 0.001 in.), which Rhino's sheet rounds to 1,600. Flake system per Simiron's guide: 6–8 mil base (we use 7), ¼ in. chip at 6 sq ft per lb (240 sq ft per 40-lb box), polyaspartic top at your wet mils. Spray passes use the 20–80 mils per pass in our polyurea guide. Estimates; your product's sheet governs.

Site conditions

Moisture, temperature and humidity

Spray polyurea is the more forgiving of the two in cold, damp air: two sheets list substrates down to −20°F and one calls it "relatively insensitive to moisture and temperature." Polyaspartic wants 30–40°F and up, speeds up in humid air, and caps slab moisture at 3 lb or 75–80% RH when it goes straight onto concrete. Neither one likes a wet slab.

ConditionSpray polyureaPolyaspartic
ColdSubstrate to −20°F (Rhino HP 11-50; Polyeuro 5502 and 7502)35°F (Simiron, Fast grade below 60°F); 40°F (RhinoSeal, Deco-Crete); 30°F for one interior product
HeatSubstrate to 120°F (Rhino)85°F max (Simiron); 120°F (RhinoSeal); working time shrinks
Humid air"Relatively insensitive" (Polycoat); spray "at low temperatures and high humidity" (Rhino)Cure speeds up; 80% RH roughly halves working time; haze or blush risk; 85% RH max (Deco-Crete)
Dew pointSurface at least 5°F aboveSurface at least 5°F above
Slab moistureNo limit on the two spray sheets; typically primed. Vapor still causes pinholes.≤3 lb/1,000 sq ft/24 h (ASTM F1869) or ≤75% RH (Simiron) / ≤80% RH (RhinoSeal, Deco-Crete) by ASTM F2170
Data sheets as named. Dew-point rule and the 80–85% RH cap most manufacturers set are from ArmorThane's guide to weather conditions for coating application.

Two cautions. First, polyurea's moisture tolerance is about the air at the gun, not a wet slab. Our blister and pinhole tech tip explains that moisture trapped in the substrate expands under the reaction's heat and pushes up through the uncured film; moisture blisters can show up 10 to 24 hours after spraying. A slab pushing vapor needs to be tested and dealt with before either coating goes down, usually with a 100%-solids epoxy moisture-barrier primer (one is rated to 25 lb or 95% RH). We don't make epoxy, and this is exactly where it earns its place; see polyaspartic vs epoxy.

Second, the cold-weather claims. Some comparison pages say floors can go down at −30°F or −40°F. We couldn't find a data sheet that recommends that for a floor system. One polyaspartic sheet says it "can be applied below −20°F" with "special handling," while recommending 40–120°F. Believe the recommended range.

Interactive tool 4 of 4

Polyurea or polyaspartic: where each one wins

Polyaspartic wins where the job is a decorative, hard-wearing surface on sound concrete, especially in sunlight: garages, showrooms, kitchens, pool decks. Spray polyurea wins where the job is a membrane: waterproofing over living space, moving cracks, truck beds, tanks, containment and roofs. Where a floor needs both, the hybrid does both.

Polyaspartic

Garage and shop floors

Flake or quartz systems, back in service the next day, UV-stable by the door. A sprayed membrane is overkill on a dry, sound slab. More in polyurea garage floors.

Polyaspartic

Showrooms, kitchens, kennels

Hard, glossy, easy to clean, with quartz for traction. Check the chemical chart: Simiron's sheet rates 10% nitric acid "not recommended."

Either

Pool decks and patios

Full sun rules out plain aromatic polyurea. Polyaspartic over sound concrete, or aliphatic spray polyurea where the deck moves or needs waterproofing.

Hybrid

Balconies and decks over rooms

Needs a waterproof, crack-bridging membrane first. Polyurea base, UV-stable top. Polyaspartic alone is too thin and too stiff.

Spray polyurea

Truck beds and trailers

Impact, abrasion and a thick textured liner. Aromatic polyurea is the standard; add a UV topcoat if the color matters.

Spray polyurea

Containment, tanks, ponds

Seamless, thick and stretchy. Potable water needs a certified product; our AquaSafe is rated for direct contact with drinking water and stretches up to 450%.

Spray polyurea

Roofs

A membrane job. Aromatic with a light-stable topcoat, or aliphatic straight through.

Spray polyurea

Steel and equipment

A thick barrier coat. Some grades go on mild steel without primer (Polyeuro 5502, HighLine 510).

Which one fits your job?

Rolled polyaspartic, spray polyurea, or both?

Answer eight questions. The scoring weighs published data-sheet limits (elongation, per-pass thickness, UV, temperature and moisture) against your job.

Rolled polyaspartic systemBest fit for these answers
Best fit · 13 pts

Rolled polyaspartic system

  • + garage and shop floors are polyaspartic’s home turf
  • + UV-stable
  • + no movement to bridge, so a thin hard coat is enough
  • + flake, quartz and high gloss are standard
  • + a roller crew can install it

How polyaspartic floors are built

Weaker fit · 2 pts

Spray polyurea base + polyaspartic topcoat

  • + garage and shop floors are polyaspartic’s home turf
  • + decorative top over a tough base
  • − the base needs a rig

How the hybrid works

Poor fit · -2 pts

Aliphatic spray polyurea

  • + garage and shop floors are polyaspartic’s home turf
  • + UV-stable
  • − needs a rig you don’t have

HighLine 410 aliphatic polyurea

Poor fit · -7 pts

Aromatic spray polyurea + UV-stable topcoat

  • − some yellowing where sun hits
  • − textured, amber-prone finish
  • − needs a rig you don’t have

What aromatic polyurea is good at

Scores weigh data-sheet traits (elongation, per-pass thickness, UV, temperature and moisture limits) against your answers. A starting point for the conversation with your applicator, not a specification. Find an ArmorThane applicator.

Using both

Polyurea base, polyaspartic top: the hybrid system

When a surface needs movement and waterproofing plus good looks, you stack them: an elastomeric polyurea base for thickness and crack bridging, then a polyaspartic topcoat for UV stability, gloss and cleanability. Covestro lists polyaspartic topcoats "for polyurea," and our ArmorFloor TopCoat is described as a topcoat "for waterproofing membrane systems."

  1. Test and prepare

    Moisture test the slab (ASTM F1869 or F2170), profile it by grinding or shot blasting, repair cracks, and prime as the base coat's sheet requires.

  2. Spray the base

    Build the polyurea to the specified mils in one visit. Watch the base's recoat window: 0–6 hours on Polyeuro 5502, 4 hours or less on Rhino HP 11-50.

  3. Broadcast if you want texture

    Chip or quartz for looks and traction, per the system you're building.

  4. Roll the polyaspartic top

    10–16 wet mils per coat, in batches small enough to place in the working time. Our ArmorFloor TopCoat goes on at 14 ± 2 mils dry per coat.

  5. Cure by the topcoat's clock

    The polyurea is walkable in hours, but the polyaspartic sets the schedule: foot traffic in 2–4 hours on RhinoSeal PA, vehicles at 24 hours, full cure in 4–7 days.

Why not an epoxy base?On a dry interior slab that only needs priming, a 100%-solids epoxy primer is a legitimate, cheaper base, and on a damp slab it's the moisture barrier. If the base has to move or waterproof, though, it needs to be elastomeric; a rigid base under a thin top gives you the weaknesses of both. Our polyurea vs epoxy floor coatings page covers that choice in depth.
Price

Polyurea vs polyaspartic cost

Installed, they're priced about the same, largely because on garage floors they're often the same system. HomeGuide (December 2024) puts polyurea garage floor coatings at $5–$10 per square foot, or $2,000–$5,800 for an average two-car garage, and polyaspartic at $5–$12, or $2,000–$6,900. Epoxy runs $4–$10.

CoatingInstalled per sq ftTwo-car garageSource (date)
Polyurea$5–$10$2,000–$5,800HomeGuide (Dec 2024)
Polyaspartic$5–$12$2,000–$6,900HomeGuide (Dec 2024)
Epoxy$4–$10$1,600–$5,800HomeGuide (Dec 2024)
Split, any of the aboveMaterials $1–$6; labor $3–$6—HomeGuide (Dec 2024)
Publisher estimates, not a survey. Prep, crack repair, moisture mitigation and stem walls add to most quotes. Our garage floor coating cost guide breaks those down.

Where the real cost difference is

  • Thickness. A 60-mil sprayed membrane uses five times the material of a 12-mil topcoat on the same floor. Run both in the material calculator.
  • Aromatic vs aliphatic. Aliphatic spray polyurea "can cost more than double" aromatic, per our polyurea guide. That premium is why sunlit membranes often get an aromatic base and a light-stable top instead.
  • Equipment, for contractors. A spray rig is $15,000–$35,000 to start and $80,000–$200,000+ for a production trailer. A polyaspartic crew runs on hand tools, though both need grinding and dust-control gear. Our starter packages begin at $25,000.
  • Service life. Installers quote similar lifespans for both, and we found no independent long-term field study that separates them. Don't choose on a lifespan claim; choose on the job.
Safety

Safety, odor and VOCs

Both are isocyanate chemistries, so the risk is during application, not after cure. OSHA says the main effects of hazardous isocyanate exposure are "occupational asthma and other lung problems, as well as irritation of the eyes, nose, throat, and skin," and lists surface coatings among the exposure sources.

  • Spray polyurea atomizes the material, so sprayers work in full protective gear with ventilation, and bystanders stay out. The spray sheets we read list 100% solids.
  • Polyaspartic isn't atomized when rolled, but it's still an isocyanate product. Simiron specifies safety glasses with side shields, nitrile gloves and "properly fitted NIOSH approved respirators." RhinoSeal PA's sheet says it's combustible: extinguish pilot lights and ventilate.
  • VOC varies a lot among polyaspartics: under 50 g/L (Simiron, RhinoSeal) to under 150–160 g/L (Deco-Crete, Aspartic 85). Southern California's Rule 1113 caps floor coatings at 50 g/L, so check the number if you're in an air district with limits.

Follow the safety data sheet for whichever product goes down, and get the re-entry time from your installer in writing.

ArmorThane

Where ArmorThane fits: we make both

We've been in the coatings business for more than 35 years, and we make both spray polyureas and ArmorFloor, an aliphatic polyaspartic for floors. So we don't need you to pick one. If your job is a decorative garage floor on a dry slab, a pro roller crew with a polyaspartic system is the right call, and you shouldn't pay for a spray rig to show up. If it's a deck over a bedroom, a truck bed or a containment pit, a rolled coat is the wrong tool.

On the spray side: HighLine 510 is an aromatic pure polyurea, tack-free in under 60 seconds, that needs a UV topcoat outdoors. HighLine 410 and ArmorFlex UV are aliphatic and color-stable. See the full line of ArmorThane polyurea products. On the floor side, the advantages of polyaspartic coatings covers where ArmorFloor shines. Whatever you buy, from us or anyone, ask for the data sheet and compare it to the tables above.

Find a certified applicator →ArmorFloor polyaspartic
Close-up of a glossy full-broadcast flake floor coating in a garage
A full-broadcast flake floor: the most common "polyurea" floor is a rolled system like this.
20–80 mils

Per spray pass

Heated plural-component application at 2,000–3,000 psi, per our polyurea guide.

5 mils min.

ArmorFloor film

By roller, spray or cup gun. Never diluted.

14 ± 2 mils

ArmorFloor TopCoat

Dry film per coat over membranes; Shore D 65 ± 5; 3,500 psi tensile.

For contractors

Rig or roller? Talk to us about both.

Plenty of coating businesses run both: a spray polyurea rig for beds, decks, roofs and containment, and a roller crew for decorative floors. We make the chemistry for each, build the rigs, and train your crew at your location. Startup packages from $25,000. Not a franchise: no franchise fee, no royalties.

Talk to us about a rigPolyurea equipment guide

Rather call? US (417) 831-5090 · Canada 780-444-6200

Straight answers

Polyurea vs polyaspartic FAQ

Is polyaspartic the same as polyurea?

Polyaspartic is a type of polyurea: an aliphatic polyurea made by reacting an aliphatic isocyanate with a polyaspartic ester, a hindered amine that slows the reaction from seconds to minutes. Chemically they're family. In practice, spray polyurea is a thick, stretchy membrane applied with a heated rig, and polyaspartic is a thin, hard, UV-stable coat a crew can roll.

Which is better, polyurea or polyaspartic?

Neither across the board. Spray polyurea is better for waterproofing, moving cracks, impact, truck beds, tanks and roofs, thanks to 250–400% elongation and builds of 30 mils and up. Polyaspartic is better for decorative floors in sunlight and for crews without a spray rig. Many floors and decks use a polyurea base under a polyaspartic topcoat.

Is a “polyurea” garage floor really polyaspartic?

Usually. One-day “polyurea” garage floors are typically a rolled basecoat, a flake broadcast and a polyaspartic topcoat, not a sprayed membrane. Ask whether any coat is sprayed with a plural-component rig, and ask for the data sheet. Our polyurea garage floor page covers the options.

Can you roll on polyurea?

Not conventional pure polyurea. It gels in 4–20 seconds on the data sheets we checked, so it has to be mixed at the gun by heated plural-component equipment. Coatings sold as roll-on polyurea use slower chemistry, most often polyaspartic.

Can polyaspartic be sprayed?

Yes. It can go on with an airless or cup gun as well as by squeegee and roller; our ArmorFloor instructions say an airless sprayer gives the best results, at 5 mils minimum. It's still premixed with a limited working time, and coats that are too thick can haze, so stay within your product's per-pass limit (10–16 wet mils on one sheet we checked).

Does polyurea turn yellow in the sun?

Aromatic polyurea does: it darkens or ambers, a cosmetic change that data sheets say doesn't affect performance. Aliphatic polyurea and polyaspartic hold their color. For sunlit surfaces, use an aliphatic polyurea like HighLine 410, or put a UV-stable topcoat over an aromatic base.

Is polyaspartic more flexible than polyurea?

No. The spray polyureas on the sheets we checked stretch 250–450% before breaking; floor polyaspartics stretch 2.4–50%. Polyaspartic is harder and stronger in tension, which makes it a good wear surface, but it won't bridge a crack that moves.

How thick are polyurea and polyaspartic coatings?

Spray polyurea is built 20–80 mils per pass, with data-sheet minimums of 30–40 mils. Polyaspartic goes on 10–16 wet mils per coat; a flake system with a polyaspartic topcoat measures over 50 mils nominal, most of it chip. The material calculator converts mils to gallons.

Which costs more, polyurea or polyaspartic?

Installed, about the same. HomeGuide (December 2024) lists polyurea garage floors at $5–$10 per square foot and polyaspartic at $5–$12. Thickness, aliphatic chemistry and prep move the price most; see our garage floor coating cost guide.

Can polyurea or polyaspartic go outdoors or on a pool deck?

Yes, if the chemistry is UV-stable. Polyaspartic and aliphatic polyurea hold their color in sun; plain aromatic polyurea needs a topcoat. If the deck moves or covers living space, use a sprayed membrane with a UV-stable top.

Can I apply polyurea or polyaspartic myself?

Spray polyurea isn't a DIY product: it needs a heated, high-pressure proportioner and a trained sprayer. Retail polyaspartic kits exist, but working time can drop to 14–28 minutes in humid air on the faster grades (Simiron), and the slab still needs diamond grinding. Most homeowners do better with a certified installer; find one near you.

Can polyaspartic go over polyurea or epoxy?

Yes. A polyaspartic topcoat over a sprayed polyurea base is a standard hybrid system, applied within the base's recoat window on its data sheet. Polyaspartic over an epoxy base is common too; our polyaspartic vs epoxy guide covers that system and coating over an existing epoxy floor.

How long do polyurea and polyaspartic last?

Installers quote similar service lives for both, and we found no independent long-term field study that separates them. What decides life is prep, slab moisture, thickness and matching the chemistry to the job. A mismatched system fails early no matter which one it is.

AT
ArmorThane Technical Team · Springfield, Missouri
Written from published data sheets for both chemistries and 35+ years of making coatings and supporting the applicators who spray and roll them. Last updated September 26, 2026.

Methodology and sources

Data-sheet values are quoted as each manufacturer publishes them, with the test method and conditions where given. Different labs, film thicknesses and cure schedules make cross-brand comparisons directional. Interpolated working times, dew points, gallons and scores are our calculations. Brand names appear only where they're the published data; this isn't an endorsement or a criticism of any product.

  1. Wikipedia, Polyurea: en.wikipedia.org/wiki/Polyurea
  2. Wikipedia, Polyaspartic esters: en.wikipedia.org/wiki/Polyaspartic_esters
  3. Covestro, polyaspartics brochure (PDF): solutions.covestro.com/-/media/covestro/solution-center/brochures/mate
  4. J. Dormish, Polyaspartic Coatings, Adhesives & Sealants Industry (Mar. 2016): adhesivesmag.com/articles/94477-polyaspartic-coatings
  5. Rhino Linings, Rhino Extreme HP 11-50 data sheet: rhinolinings.com/download/rhino-extreme-hp-11-50-tds/
  6. Rhino Linings, RhinoSeal PA polyaspartic data sheet (Mar. 2026): rhinolinings.com/download/rhinoseal-pa-polyaspartic-system-tds/
  7. Polycoat Products, Polyeuro 5502 data sheet (PDF): polycoatusa.com/wp-content/uploads/2026/01/PCWP_TDS_POLYEURO-5502.pdf
  8. Polycoat Products, Polyeuro 7502 aliphatic data sheet (PDF): polycoatusa.com/wp-content/uploads/2026/01/PCWP_TDS_POLYEURO-7502.pdf
  9. Simiron, Polyaspartic HS product data sheet (Apr. 2026, PDF): simiron.com/wp-content/uploads/2020/09/SIM_Polyaspartic-HS_ProductData
  10. Simiron, SimFlake SB 1-Day Polyurea system guide (PDF): simiron.com/wp-content/uploads/2024/07/SIM_SimFlake-SB_1-Day-Polyurea_
  11. Simiron, MVB moisture vapor barrier sell sheet (PDF): simiron.com/wp-content/uploads/2020/09/SIM_MVB_SELLSHEET_8.5x11.pdf
  12. Deco-Crete, Polyaspartic 90 data sheet (PDF): deco-cretesupply.com/sites/default/files/2022-08/Polyaspartic%2090%20S
  13. Exterior Coatings, Aspartic 85 low-temp polyaspartic: exteriorcoatings.com/product/aspartic-85-low-temp-polyaspartic-concret
  14. HomeGuide, garage floor coating cost (Dec. 2024): homeguide.com/costs/garage-floor-coating-cost
  15. OSHA, Isocyanates: osha.gov/isocyanates
  16. South Coast AQMD, Rule 1113 architectural coatings (PDF): aqmd.gov/docs/default-source/rule-book/reg-xi/r1113.pdf
  17. Wikipedia, Dew point (Magnus formula): en.wikipedia.org/wiki/Dew_point
  18. ArmorThane, polyurea guide: armorthane.com/polyurea-guide/
  19. ArmorThane, polyurea equipment guide: armorthane.com/knowledge-center/polyurea-equipment-guide/
  20. ArmorThane, weather conditions and coating application: armorthane.com/weather-conditions-coating-applications/
  21. ArmorThane, blister and pinhole troubleshooting: armorthane.com/tech-tips-blister-pinhole-troubleshooting/
  22. ArmorThane, what is aromatic polyurea: armorthane.com/what-is-aromatic-polyurea/
  23. ArmorThane, HighLine 510 pure polyurea: armorthane.com/products/armorline-products/high-pressure/highline-510-
  24. ArmorThane, HighLine 410 aliphatic polyurea: armorthane.com/products/armorline-products/high-pressure/highline-410-
  25. ArmorThane, ArmorFlex UV: armorthane.com/products/armorline-products/high-pressure/armorflex-uv/
  26. ArmorThane, AquaSafe pure polyurea: armorthane.com/products/armorline-products/high-pressure/aquasafe-pure
  27. ArmorThane, ArmorFloor aliphatic polyaspartic: armorthane.com/products/armorflooring-product-page/armorfloor-aliphati
  28. ArmorThane, ArmorFloor TopCoat: armorthane.com/products/armorcoat/armorfloor-topcoat-4/

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