Epoxy Floor Troubleshooting

You do not need to know what it is called to find it here. Start with what the floor actually looks like, narrow it with one physical test, and land on the page that explains the cause and the repair.

Three questions, answered from memory on the jobsite. What the floor looks like, when the fault showed itself, and what the slab and the weather were doing. You get the candidates ranked, with the reason each one ranked where it did.

Uncured epoxy is a chemistry problem, and the chemistry is decided before the material leaves the bucket. The pattern of the softness tells you which mistake it was: a whole floor that never hardened is a ratio error, patches in an otherwise sound floor are a mixing error, and a floor that is merely slow is usually just cold.

Hot tire pickup is not a random failure, and where it happens is most of the diagnosis. A warm tire sitting still on a coating that could not resist it lifts the film in tire shaped patches while the rest of the bay stays perfect. The cause is almost always one of three: a product never rated for vehicle traffic, a floor driven on before it finished curing, or a bond to the slab that was marginal from the start.

Three unrelated problems produce the same milky finish, and they need three different repairs. Blush lies on top of the film and washes off with water. Micro foam is millions of tiny bubbles trapped inside it. Moisture comes up through the slab, and it will do it again. Work out which one you have before you touch the floor.

The underside of the flake settles this in about two seconds. Concrete on the back means the bond to the slab failed and you are on the wrong page. Coating on the back means the layers never bonded to each other, and that is almost always a recoat window that closed before anybody expected it to, or something invisible sitting on the surface when the next coat went down.

Lap marks are a timing problem far more often than a skill problem. A coating flows together only while both passes are still wet, and the window for that is shorter than most people think, especially on a warm slab. Here is what causes the banding, how to tell it from the other texture faults, and what is worth doing about it.

A flake floor is the one system where the defect is usually something absent rather than something present, and that changes how you diagnose it. Thin patches are almost always a record of how the flake was thrown and how much time the base coat gave you, not of the material itself. Here is how to read the pattern and work out which.

A topcoat that feels like fine sandpaper is usually one of three things, and one test separates them: is the grit sitting on the film, cured into it, or is it the surface underneath showing through a coat that was too thin to bury it? The answer decides whether this is a wipe, a screen and recoat, or another full coat of material.

A wrinkled floor is a film that set at two different speeds. The surface skinned over while the material underneath was still moving, and the skin buckled rather than stretched. Nearly every case comes down to one of three things: the coat was too thick, the surface was heated far faster than the body, or it was recoated before the coat beneath it had finished.

Cut one open. If air escapes, you have a bubble and the problem happened while the floor was being laid. If liquid runs out, you have an osmotic blister, the slab is still wet, and the coating is being pushed off from underneath by a pressure that is not going to stop on its own. The two look identical and need completely different answers.

A streaked floor is usually a mixing failure wearing an application costume. The bands look like they came from the roller, so that is where people go looking, but the pigment was already unevenly distributed before any of it reached the floor. Knowing which of the two you have decides whether the fix is a technique change or a recoat.

Every other coating defect starts from the same assumption: the floor should be uniform and it is not. A metallic floor breaks that, because the unevenness is the product you sold. This page is about telling which unevenness is the effect working and which is a fault, and the honest answer to that begins with a sample board rather than a description.

Polyaspartics are fast by design, which is most of why people buy them, so "it cured quickly" is not a fault on its own. The fault is when it cures faster than you can work, and the usual cause is not the product at all. It is the temperature of the slab you poured it onto, which compresses every stage of the cure at once.

Most cloudy clear coats are blush sitting on the surface, and warm water takes them off. This is the one that does not come off, because the whiteness is not on the coating, it is in it. Polyaspartics react with moisture as they cure, and that reaction makes gas inside a film that is already closing.

Almost every slippery floor complaint arrives about a coating that did exactly what it was asked to do. Nothing failed. Grip is something you add on purpose, and if nobody added it, the floor will be fine dry and dangerous wet. Here is what the media are, how much of each goes in, and how to retrofit a floor without taking it back to concrete.

A crack that reappears through a new floor is almost never a coating failure. The concrete underneath is still moving, and no coating a few thousandths of an inch thick is going to hold two slabs together. What decides whether the repair holds is a question that gets asked far too late: is this crack still moving?

Bubbles almost always trace back to one of two places: moisture vapor pushing up from the slab, or trapped air expanding as the concrete warms. Here’s how to tell which, and how to fix and prevent it.

That cloudy, milky, or greasy film is called amine blush, a reaction between the curing agent and moisture or CO2 in the air, not a mixing mistake. Here’s what causes it and how to get rid of it.

That amber or yellow tint is almost always UV breaking down the resin, but where it shows up on the floor tells you whether it’s sunlight, leftover blush, or ordinary aging. Here’s how to tell them apart.

Peeling (delamination) almost always means the bond never really formed, and the cause is usually surface prep rather than the coating itself. Here’s what causes it and how to prevent it on the next job.

A pinhole is a bubble that broke before the film could flow back together. That one sentence explains why pinholes and bubbles share their causes but need completely different fixes: one is about the gas, the other is about whether the coating could still heal when the gas got out.

A fisheye is the coating refusing to touch something. Nothing punctured the film and no gas escaped through it: the wet resin met a spot it could not wet and pulled away, leaving a circular void with a raised rim. That makes it a contamination problem, and it is the one defect that gets worse if you reach for a solvent rag.