How to Fix a Spalling Concrete Driveway: Step-by-Step Guide

Spalling — the progressive flaking and pitting of the concrete surface — is one of the most common driveway problems in cold climates. Left untreated, it worsens every winter as water works deeper into the exposed aggregate.

Spalling — the progressive flaking and pitting of the concrete surface — is one of the most common driveway problems in cold climates. Left untreated, it worsens every winter as water works deeper into the exposed aggregate. The fix is within reach of most homeowners: clean the surface thoroughly, remove all loose material, and apply a concrete resurfacer that bonds to the sound base and creates a fresh wearing surface.

What You Are Actually Fixing

Spalling removes the hardest part of the concrete — the cement paste layer that was troweled smooth during the original pour. What remains is rougher aggregate and a porous surface that absorbs water even faster. Resurfacing replaces that wear layer with a fresh, bonded overlay. The key to making it last is preparation: any loose material left under the overlay will cause it to pop off within a season.

Tools and Materials

• Pressure washer (2,000 PSI minimum)
• Wire brush and cold chisel
• Angle grinder with diamond cup wheel (for stubborn areas)
• Concrete resurfacer (Quikrete Concrete Resurfacer or equivalent)
• Concrete etching solution (muriatic acid or phosphoric acid etcher)
• Rubber squeegee or concrete brush
• Mixing drill with paddle attachment
• Five-gallon bucket
• Broom or brush for texture
• Penetrating concrete sealer
• Safety glasses, rubber gloves, and rubber boots
• Plastic sheeting for curing

Step 1: Remove All Loose and Spalled Material

Start with a cold chisel and hammer to knock off any concrete that sounds hollow when tapped or that moves when pressed. Strike at a low angle to undercut and lift flaking sections. An angle grinder with a diamond cup wheel works faster on large areas and gives you a cleaner profile for the overlay to bond to.

Do not skip this step or try to cover loose material — it is the single most common reason resurfacing jobs fail.

Step 2: Pressure Wash the Surface

Use a pressure washer at 2,000 to 3,000 PSI with a 15- or 25-degree tip to clean the entire driveway surface. Work methodically, overlapping passes. Remove all dirt, oil stains, algae, and loose dust. Pay extra attention to the edges of spalled areas where loose material may be hiding under what looks like intact concrete.

Allow the surface to dry completely, or work when the surface is saturated surface dry (SSD) — damp but with no standing water. Concrete resurfacer bonds better to a damp surface than a bone-dry one.

Step 3: Etch the Surface

Apply a concrete etching solution according to the manufacturer’s instructions. Etching opens the pores of the existing concrete and creates a mechanical profile for the resurfacer to grip. Pour the etcher onto the damp surface, scrub with a stiff brush, and let it react for 5 to 10 minutes. You will see light fizzing — that is normal. Rinse thoroughly with the pressure washer and allow to dry.

Skipping the etch step is a common shortcut that leads to delamination within a year or two.

Step 4: Fill Deep Holes and Cracks

For pits deeper than 1/2 inch or cracks wider than 1/4 inch, use a concrete patching compound to pre-fill those areas before the full resurfacing coat. Allow patches to cure according to label directions (typically 4 to 6 hours). Hydraulic cement or polymer-modified patch works well for this step. Feather the patch edges so there is no abrupt height change for the resurfacer to bridge.

Step 5: Mix the Concrete Resurfacer

Mix the resurfacer in a clean five-gallon bucket following the product ratio exactly. Typical mixing ratios are about 3.5 quarts of water per 40-pound bag. Use a drill with a mixing paddle — do not mix by hand, as you will not achieve a uniform consistency. The finished mix should be pourable but not watery, roughly the consistency of a thick pancake batter.

Mix only as much as you can apply in 20 minutes. Work in manageable sections.

Step 6: Apply the Resurfacer

Wet the concrete surface lightly with a garden hose immediately before applying (the surface should be damp, not ponded). Pour the resurfacer directly onto the surface and spread it with a rubber squeegee or concrete brush, working it into all pits and low spots. Aim for a uniform thickness of about 1/8 to 1/4 inch.

Work quickly and keep a wet edge. If you stop in the middle of a section, you will see a lap line in the finished surface.

Step 7: Add Texture and Cure

Before the surface stiffens (usually 5 to 10 minutes after application), drag a stiff-bristled brush or broom across the surface in one direction to create a slip-resistant texture. The texture also hides minor trowel marks.

Cover the finished surface with plastic sheeting to retain moisture and allow it to cure slowly. Leave the plastic in place for at least 24 hours. Keep vehicles off the driveway for a minimum of 24 hours, and ideally 72 hours before heavy traffic.

Step 8: Apply a Concrete Sealer

Once the resurfacer has fully cured (7 days recommended before sealing), apply a penetrating concrete sealer to protect the surface from water intrusion and future deicing salt damage. A quality sealer is the single best investment you can make to extend the life of the repair. Reapply every 2 to 3 years as part of routine driveway maintenance.

Related Reading

• Concrete Driveway Cost — if spalling is extensive, full replacement is often cheaper than resurfacing