Concrete Resurfacing:
Cost, Options &
When to Replace

What concrete resurfacing actually is

Resurfacing is a bonded overlay. You are not pouring a new slab on top of the old one; you are gluing a thin layer of polymer-modified cement, or a resin coating, to concrete that already carries the load. The old slab does the structural work. The new layer only has to stick, resist wear and look good.

That distinction drives everything else. A bagged cement resurfacer such as Quikrete Re-Cap is rated from a feather edge of 1/16 in up to 1/2 in thick, and SikaQuick Concrete Resurfacer runs from feather edge to 1/2 in as well. Those are thin layers. They cannot bridge a void under the slab, lift a sunken panel or stop a crack that is still moving. Quikrete's own data sheet warns that old cracks can reappear because of movement in the base concrete.

What resurfacing does well:

• Covers surface scaling, the flaking you see on driveways after a few winters of salt.
• Hides pop-outs, pitting, trowel marks, old patch lines and stains that will not clean.
• Restores a level-looking, uniform color on a patio, walkway, pool deck or garage floor.
• Gives a coating system (polyaspartic, polyurea, epoxy) a smooth, sound base when the slab is too rough to coat directly.

Concrete resurfacing options compared

"Resurfacing" covers several different products. They differ in thickness, in how rough the old concrete has to be before they will bond, and in price. The surface profile column uses the ICRI concrete surface profile scale (CSP 1 is nearly flat, CSP 10 is very rough). The general rule from ICRI's guidance is simple: the thicker the system, the more tooth it needs.

Two practical notes from the field. First, a "spray-down" or "knockdown" finish is still a cement overlay underneath; the texture is applied over a base coat, so it has the same crack sensitivity. Second, a resin coating is not a resurfacer on its own. A polyaspartic or polyurea floor system is built in mils, not inches, so deep scaling has to be filled with a patching mortar or a resurfacer first. That combination, a resurfacer to rebuild the plane and a coating to protect it, is common in garages and on pool decks.

How we prep and apply a concrete resurfacing overlay

Every resurfacer data sheet we have read says the same thing in different words: the surface must be clean, sound and profiled. SikaQuick Concrete Resurfacer calls for a minimum ICRI CSP 3. Quikrete specifies pressure washing at 2,500 psi and removing all loose concrete, paint and grease. Here is the sequence our applicators follow.

1. Sound the slab

   Drag a chain or tap with a hammer and mark every hollow-sounding area. Delaminated concrete has to come out; an overlay bonded to a loose layer fails with it.

2. Strip what will not bond

   Paint, sealers, curing compounds and acrylic or polyurethane crack fillers all block bond. Quikrete specifically says not to apply Re-Cap over painted or sealed surfaces or those fillers.

3. Profile mechanically

   Pressure washing is the minimum for a cement skim coat. For trowel overlays and coatings we diamond-grind or shot-blast to the profile the product calls for. Acid etching does not give a consistent profile and leaves residue.

4. Repair cracks and spalls first

   Fill spalls deeper than the overlay with a repair mortar. Route and fill static cracks; leave moving cracks and joints as joints. W. R. Meadows notes that active and exterior cracks may telegraph through its resurfacer.

5. Honor the joints

   Tape off or tool the existing control and expansion joints and carry them through the new layer. A resurfacer bridged over a joint will crack right on top of it, usually within the first season.

6. Pre-dampen and place

   Cement resurfacers go on a saturated, surface-dry slab with no standing water. Working time is short; Quikrete and Sika both list about 20 minutes, so we mix in batches and work in sections.

7. Cure it

   Moist cure for 24 to 48 hours per Quikrete, or use wet burlap, misting or a curing compound per Sika. Quikrete rates Re-Cap for foot traffic in 8 hours and vehicles in 24 hours at normal temperatures.

8. Seal or coat

   Exterior overlays need a breathable concrete sealer; garages and shops usually get a full coating system. Primers such as ArmorPrime are matched to the coating, not to the overlay.

Why concrete resurfacing fails

When we are called to look at a failed overlay, the cause is almost always one of the following. None of them is the product's fault.

Resurfacing in freeze-thaw country

Scaling is the reason most driveways get resurfaced in the first place. Per the industry's Concrete in Practice guidance, the root causes are concrete without enough entrained air, deicing salts on concrete that lacks strength, air or curing, finishing while bleed water is on the surface, and poor curing. A resurfacer fixes the look, but it will scale too if it gets the same abuse. Seal it, use plain sand or a gentle deicer the first winter, and shovel instead of salting where you can.

Related concrete repairs

Most resurfacing jobs start with repairs. Narrow and moving cracks are covered in our concrete crack repair guide, and holes over rusty steel need the saw-cut-and-patch method in spalled concrete repair before any overlay goes down. White, crusty deposits on the slab mean moisture is moving through it; read up on efflorescence before you coat. And if the foundation wall beside the patio or steps needs the same treatment, that is parging, the vertical cousin of a resurfacer.