How to Patch Holes in Pool Deck | Repairs That Last

Most pool-deck holes need a surface patch, but knowing how to patch holes in a pool deck starts with reading the damage. Small cracks and spalls — spots where the top layer has flaked off — respond well to a cementitious patch. Sunken slabs or holes that follow a pattern of voids underneath usually mean the concrete has settled, and that calls for lifting, not patching. Do the prep right and a patch blends in and lasts for years.

What Kind of Damage Are You Dealing With?

Look at the hole before buying anything. A shallow spall or hairline crack takes a simple patching compound. Widespread spalling, deep pitting, or clusters of cracks point to a failing surface layer that a patch won’t save — that situation calls for a full resurfacing overlay.

Sunken slabs are a different problem entirely. Contractors fix these by drilling small holes and injecting polyurethane foam underneath to lift the slab back to level, then patching the injection holes and sealing the cracks. That’s structural lifting, not cosmetic patching, and no top-surface patch will fix a slab that has settled.

The Prep Work That Decides Success

Every patching product on the market agrees on this: the substrate must be sound, clean, and dry. The most common mistake people make is patching over loose, dirty, or damp concrete — the patch cures, then pops right off with the first freeze.

• Chip out loose and flaking material with a putty knife or scraper until you reach solid concrete.
• Clean the area with a stiff brush and water. For stubborn stains or algae, product instructions call for a mix of 1 part muriatic acid to 3 parts water, rinsed thoroughly afterward.
• Dry the surface completely. One manufacturer’s instructions specify a dry substrate, while others say “damp only” — check your product’s label. Either way, no standing water.

Muriatic acid needs respect — wear gloves and eye protection, and rinse the area well before you patch.

Mixing and Applying the Patch

The second most common mistake is guessing at the mix ratio. Both leading pool-deck repair kits specify exact proportions of liquid cement bonder to dry mix, and too much water changes how the material places and textures. Follow the numbers on the bag.

For cracks, apply the material as a putty and press it in; for small repairs, trowel it at about 1/4 inch thickness. E-Z Patch 2 works the same way: rub the material deep into cracks, or trowel small areas at 1/4 inch and tap the surface to create peaks.

That tapping and brushing isn’t cosmetic fuss — it’s how you match the surrounding texture. Kool Deck-style lace finishes and acrylic overlay systems with simulated flagstone or brick patterns all need the repair worked to blend in. Let the patch stiffen slightly, then knock down the texture or brush it to match the deck around it.

If you’re weighing which product fits your deck’s finish, our roundup of the best concrete patch for pool decks compares the top options by texture match and cure time.

Curing and Using the Deck Again

Patience here is the difference between a repair you forget about and one you redo next spring. Pool Patch says no foot traffic for at least 24 hours and no furniture for 3 days.

One manufacturer advises letting the repair dry until it no longer sticks to the touch before finishing the texture. In hot, dry weather the surface can skin over while the material underneath is still soft — give it the full cure time before you drag a lounger across it.