Pool deck coating or resurfacing in Florida: which one your deck needs

If the concrete under your pool deck is sound and dry, and the only problem is how the surface looks, a pool deck coating or a coat of deck paint can refresh it. If the old coating is peeling in sheets, blistering, or has been recoated so many times that the layers are letting go of each other, another coat will fail the same way, and the deck needs a new surface instead. The rest of this page is how to tell which one you have, from the deck itself, before anybody quotes you.

Most Gulf Coast pools poured between the mid-sixties and 1990 wear some kind of coating: an acrylic “cool deck” finish, a knockdown texture, or plain deck paint over either. We pour a shell topping, Shellcrete by SRQ Modern, so one of the two answers below is ours. The other is not, and on a sound slab with a coating that is wearing evenly, it is often the right call.

What a pool deck coating actually is

Paint, acrylic coatings and spray-on textures are all films. They are rolled, troweled or sprayed onto the concrete, and they cure into a layer that sits on top of it. However thick the texture looks, it holds on to the deck only through its bond to the surface underneath.

That is the strength and the weakness in one sentence. A film goes over almost anything, quickly, and changes the colour completely. But it can only hold as well as whatever it is stuck to. Put a new coat over an old one and the new coat is stuck to the old coat, which is stuck to the one before it, and the whole stack fails at its weakest bond.

Pool decks are hard on films. Sun breaks down the surface, pool chemistry and salt sit on it, and water arrives from above and from below. Moisture rising through a slab gathers under a film it cannot pass through, and that is where most blisters come from.

How to tell whether your pool deck can take another coat

Four checks, and you can do all of them yourself with a coin and a roll of tape.

• Look at how it is wearing. Even wear, where the colour has faded and the texture has flattened but the coating is still there, is a coating that can usually be cleaned, prepared and recoated. Coating coming off in sheets or flakes, with bare concrete showing underneath, means the bond has gone.
• Tap it. Go over the deck with a coin or the handle of a screwdriver. A solid ring means the coating is holding. A hollow, drummy sound over a patch means it has let go of the slab there, even where it still looks whole.
• Tape it. Press a strip of duct tape hard onto a clean, dry patch and pull it off sharply. If it comes away with coating stuck to it, that coating will not hold a new coat either.
• Count the layers. Look at the edge of a chip or a worn step. If you can see two or three colours stacked on each other, the deck has been recoated before, and the next coat goes onto the weakest of them.

Blisters deserve their own note. A coating that bubbles and lifts in patches, rather than wearing away, is usually being pushed off by moisture from below. A second film of the same kind meets the same moisture, and a better product does not change that.

When a pool deck coating is the right answer

A coating makes sense when the slab is sound, the existing coating rings solid and passes the tape test, and what you want is a new colour or a fresher texture. It is the quickest and least disruptive option on the table, and it goes over almost anything that is still holding.

Two things decide how well it works. The first is preparation. A coating applied over dirt, sunscreen residue or a loose layer is bonded to those, not to the deck, so cleaning and profiling the surface matter more than the product on the label. The second is grip. Paint by a pool needs a slip-resistant texture or additive in it, because a smooth film beside the water is a slip waiting for a wet foot. Ask what is in it before it goes down.

Pick the palest colour you can live with, too. Colour decides most of how hot a deck gets in the afternoon, whatever the deck is made of, and a dark coating on a sunny deck is the one people end up hopping across.

When the deck needs resurfacing instead

Resurfacing is the answer when the coating is failing in sheets or blistering, when there are too many layers to trust, or when you want a different surface rather than a different colour. Resurfacing here does not mean another coat. It means a new wearing surface.

What we pour is a topping an inch and a half to two inches thick: cement, sand and crushed shell, the concrete with the shells in it, mixed on site by our own crews. It bonds to the slab, not to a film, so the old coating comes off first, down to sound concrete. The surface is then opened up so the shell shows, and finished for how each area is used: exposed shell where grip matters most, on the coping, the steps and the walk to the lawn, and honed where the loungers and the table go.

The joints in the old slab are cut through the new surface in the same places. A topping poured straight across a joint will crack along it, so the new surface keeps the slab’s lines rather than fighting them.

A topping still needs looking after. It is sealed with a penetrating, matte sealer, never a glossy film, and resealed as needed. Rinse it, keep acid off it, and get to leaf stains early. Sealing a shell deck explains why the sealer choice matters as much as the surface under it.

What neither a coating nor a topping can fix

Neither one fixes the slab underneath. A coating follows every crack beneath it, and a bonded topping does too. If a crack has one side higher than the other, has grown from one season to the next, or the deck sounds hollow over a wide area because the slab itself has moved, the slab is the problem, not the surface. The guide to a cracked pool deck walks through that test, and when to call an engineer before any contractor.

Water is the other one. A deck that holds puddles, or tilts back toward the pool, needs its falls corrected. A new surface can correct some of that, within what the coping and the door thresholds allow, and that is a question for somebody standing on the deck rather than a photograph.

Pool deck coating vs resurfacing, side by side

• What it is. A coating is a film on top of the concrete. A topping is a new layer of concrete bonded to the slab.
• What it needs underneath. A coating needs clean concrete or a coating that is still holding. A topping needs sound concrete, so the old coating comes off.
• How it fails. A coating chalks, peels or blisters. A topping can crack, which is why it is jointed on the slab’s lines.
• Grip. A coating gets it from a texture or an additive in the film. An exposed shell topping gets it from the shell itself, and a matte sealer keeps it.
• Cost. A coating is usually the least expensive option up front. What moves the number on a topping is set out in the resurfacing cost guide.

What to do next

Do the four checks, then take photos: the whole deck from a step-ladder, a close-up of the worst patch with a coin beside it, the edge of a chip showing the layers, and anywhere water sits after rain. If the coating is holding and wearing evenly, a coating contractor can refresh it, and we will tell you so. If it is peeling, blistering or stacked too deep, our pool decks page shows what goes in its place.

Send us photos of your deck for a quote, or call (941) 253-0400. We look at the slab before we talk about the surface.