Patio Coating:
What Lasts &
What It Costs

Patio coating options compared

Patio coatings fall into three groups: penetrating sealers that soak in and leave no film, film coatings that sit on top (sealers, paints, epoxy, polyaspartic, polyurea), and cementitious overlays that build a new surface. Films change the look most and demand the driest slab. Click a column header to sort.

Penetrating sealers (silane, siloxane, silicate)

These soak into the pores and make the concrete shed water without leaving a film on top. Nothing to peel, nothing to yellow, and the patio still looks like concrete. They won't hide stains or change the color. For freeze-thaw country they're the default: NRMCA's guidance on scaling says to apply "a commercially available silane or siloxane-based breathable concrete sealer" on a reasonably dry slab, and names late summer, after a few dry days, as the ideal time. HomeGuide puts professional penetrating sealing at $1–$3 per sq ft.

Acrylic sealers (clear, wet-look and tinted)

A thin film that adds sheen, darkens the color or carries a tint. It's the cheapest way to make a patio look fresh: $1–$2 per sq ft installed, or $30–$60 a gallon to roll it yourself at 200–500 sq ft per gallon (HomeGuide). The catch is life. HomeGuide says acrylic sealers "last 1 to 3 years on average," and glossy films get slick when wet unless you add grit.

Porch paint and solid stain

Acrylic porch and floor paint changes the color completely for the price of a few gallons. Home Depot's guide puts coverage at up to 400 sq ft per gallon. Paint is a film, so it needs clean, dry, etched or profiled concrete to stick, and it's the option you'll be redoing soonest. Pick a textured or anti-slip version for anywhere that gets wet. Stain goes further (up to 600 sq ft per gallon) and changes color without hiding texture.

DIY stone and textured coatings

The products in the shopping carousel for this search, such as Daich's SpreadRock and RollerRock kits, are thick textured coatings rolled or troweled over a primer and finished with two coats of sealer. The maker lists patios, pool decks and steps among the uses and says they stand up to sun, salting and snow shoveling. SpreadRock covers 50 sq ft per gallon per coat and takes two coats. It's the DIY route to a new surface that hides stains. We don't have independent life data on these.

Epoxy

Hard, glossy, cheap per square foot, and the wrong top coat for a sunny patio. More on why in the epoxy section below.

Polyaspartic flake systems

Polyaspartic is an aliphatic polyurea slowed down enough to roll. It's the chemistry behind most "one-day" flake floors, and it's aliphatic, so it holds its color in sun. One maker's data sheet lists "Exterior or Areas Exposed to UV" as a use and shows 87–89 gloss units retained after 1,000 hours of accelerated UV (ASTM G154). A typical patio system is a base coat, a full broadcast of vinyl flake, then one or two clear polyaspartic top coats. HomeGuide puts it at $5–$12 per sq ft installed and 10–20+ years. The limit is moisture: that same product allows no more than 3 lb per 1,000 sq ft per 24 hours (ASTM F1869) or 75% RH in the slab (ASTM F2170). Our polyaspartic floor coating guide covers cure times and specs.

Sprayed polyurea and ArmorDeck-type membranes

Where a patio has hairline cracks, sits over something you want dry, or doubles as a pool deck, a thicker, flexible membrane makes more sense than a thin film. Sprayed polyurea goes on at 60–80 mils on pool decks, per our pool deck resurfacing guide, with aggregate broadcast into it and a UV-stable aliphatic top coat over that. ArmorDeck does the same job with a troweled, moisture-cured base and an aliphatic top. We price sprayed systems at $6–$12 per sq ft.

Cementitious overlays, spray-knockdown and Kool Deck

Overlays are a new, thin concrete surface bonded to the old one: micro-toppings from 1/32 to 3/16 in., spray-knockdown finishes around 1/8 in., and self-leveling toppings from 1/4 to 2 in. (HomeGuide). They're the fix for a patio that's already flaking, patched or badly stained. HomeGuide puts basic patio resurfacing at $3–$7 per sq ft, decorative overlays at $6–$10, and a Kool Deck coating at $4. Seal overlays afterward.

Stamped overlays

A stamped overlay presses a stone, brick or slate pattern into a fresh overlay: $7–$15 per sq ft for a single pattern and $15–$20 for complex designs (HomeGuide). It looks like stamped concrete for less than tearing out and repouring, but it inherits stamped concrete's upkeep: a sealer every 2–3 years.

When replacing beats coating

HomeGuide's line is a good one. Resurface when the problems are minor flaking or cracks under ¼ in. Replace when there are "large cracks, crumbling, spalling, or structural problems," or when the repair needs a layer more than 2 in. thick. A new plain patio runs $4–$12 per sq ft and lasts 30–50 years. If the slab is sound but has sunk, lifting it may be all it needs; see our concrete leveling cost guide.

Can you epoxy a patio?

Not as the top coat if the sun reaches it. Standard epoxies are aromatic, and aromatic coatings yellow and chalk in UV. That's not an installer's opinion; it's printed on epoxy data sheets. On a fully covered porch, or as a base under a UV-stable top coat, epoxy can work.

Here's what the makers say. Sika's Sikafloor-261 data sheet: the product "will discolour over time when exposed to sunlight (UV)," and it's "typically not recommended for exterior slabs on grade where freeze/thaw conditions may exist." Rust-Oleum describes its water-based EpoxyShield kit as "designed for finishing concrete garage floors." Our own polyurea vs epoxy page says the same thing from the other side: epoxy "ambers, chalks and dulls under UV."

Epoxy's other outdoor problem is that it's rigid. A patio slab moves with temperature and freeze-thaw, and a stiff film over a moving crack tends to crack with it. And it's a film, so everything in the moisture section applies.

When epoxy is fine

• Covered porches and screened patios that never see direct sun, on a slab that passes a moisture test.
• As a base coat or primer under an aliphatic polyaspartic or polyurethane top coat, which is how many flake systems are built. The top coat takes the UV. Our polyaspartic vs epoxy comparison explains that stack.

Are patio coatings slippery when wet?

Smooth, glossy ones can be. Bare broom-finished concrete has built-in texture, and a clear film fills it in. HomeGuide flags polyaspartic sealers as "slippery when wet," and our own texturing page says roll-on coatings "are glossy and may become slick when wet." The fix is texture: flake, aggregate or a textured top coat. Built right, a coated patio grips well.

The number to ask for: wet DCOF

Slip resistance is measured as the dynamic coefficient of friction (DCOF). ANSI A326.3 says hard floors in level interior spaces "expected to be walked on when wet with water shall have a measured wet DCOF value of 0.42 or greater." Its exterior-wet class is manufacturer-declared and typically 0.55 or higher, per Sherwin-Williams' summary. Neither OSHA nor the ADA sets a number. For reference, one polyaspartic over a full flake broadcast tested at 0.63 wet DCOF. Ask your installer for the tested wet DCOF of the exact system and finish they're quoting, and ask to see a sample board.

Aggregate, and the bare-foot trade-off

• What goes in: ArmorDeck's base coat takes "washed sand, garnet abrasive, tennis ball, or rubber crumb, approximately 16 or 20 mesh, depending on skid resistance requirements." Resin-flooring makers use aluminum oxide in grits like #54, #36 and #24; coarser grips harder.
• Where it goes: broadcast into the wet base, or mixed into the top coat, or both. Flake systems get their grip from the flake itself plus any grit in the top coat.
• The trade-off: coarse grit is hard on bare feet and harder to sweep. Our non-slip coatings page notes that where bare feet are common, "aggregate can cause more problems than it solves," and suggests a textured spray finish instead. Pool decks and kids' play areas want fine grit or texture, not sandpaper.

Concrete patio resurfacing: overlays, stamped and spray-knockdown

Resurfacing bonds a new cementitious layer, from 1/32 in. to 2 in. thick, over the old slab. It's the right move when the concrete is structurally sound but the surface is flaking, patched, pitted or stained beyond what a sealer or stain can hide. HomeGuide prices basic patio resurfacing at $3–$7 per sq ft and says it lasts 8–15 years.

Resurface, coat or replace?

• Resurface for "minor flaking or cracks less than 1/4" wide" (HomeGuide) and for scaled surfaces, where NRMCA lists portland-cement, latex-modified and polymer-modified bonded resurfacing as the repair.
• Coat when the surface is sound and you want protection, color or grip. You can also coat after resurfacing.
• Replace with "large cracks, crumbling, spalling, or structural problems," or if the repair would need a layer more than 2 in. thick (HomeGuide).
• Lift a sound slab that has sunk or tipped toward the house. We make Lift 200 and Lift 300 polyurethane lifting foam that applicators inject for this; see foam concrete lifting.

Two cautions. First, an overlay is only as strong as the surface it's bonded to: NRMCA says the base must be sound and free of dirt, oil and paint, with everything loose removed. Second, overlays are cement, so they still need sealing. Stamped work in particular needs a fresh sealer every 2–3 years, according to HomeGuide, which is part of its real cost.

DIY patio coating: what's realistic

Sealers, stains, porch paint, stone-coating kits and bagged resurfacers are all reasonable weekend projects. Sprayed polyurea isn't, and flake systems with fast-curing polyaspartic are tough for a first-timer. The calculator shows how much to buy and what it costs for the DIY options.

A DIY coating that lasts: the steps that matter

• Clean hard. Degrease oil and grill spots, then pressure-wash and let the slab dry fully.
• Test before you buy. Water drop for old sealer, 24-hour plastic sheet for moisture. Use the ready-to-coat check.
• Etch or profile. Film products need tooth. Follow the kit's etch step, and rinse well.
• Fix cracks and flaking first. Paint and sealers don't fill cracks or rebuild scaled concrete.
• Thin coats, right weather. Stay inside the label's temperature range and 5°F above the dew point. Plan around the dry time before rain.
• Add grit if it'll get wet. Especially on steps and near a pool.

Where DIY runs out

Past a few hundred square feet, or when the slab needs grinding, crack routing or a moisture-tolerant primer, a pro's equipment is the difference. The same goes for any system you want to last a decade in full sun. A certified applicator can also give you a written thickness and a measured moisture reading, which a weekend kit can't. Find concrete coating applicators near you.

Pool decks, porches, steps and covered patios

The same chemistry covers all of these, but each one changes the priorities: grip and heat around a pool, edges and nosings on steps, UV on a covered porch, and waterproofing when there's a room underneath.