Why the Big-Box Epoxy Kit Almost Always Peels

The single most common reason someone calls to have a floor redone is a DIY kit that peeled, usually at the tire tracks, usually within a season or two of being applied. It's worth being direct about that pattern rather than dancing around it, because understanding why it happens is what prevents it happening again.

The kit's instructions are the problem

Most kits call for an acid etch — a chemical wash that roughens the surface slightly — instead of mechanical grinding. An acid etch changes the concrete's surface chemistry a little, but it does not open up the surface texture the way grinding does, and it does not remove the hard, dense layer that concrete forms at the surface when it cures.

Why that matters for bonding

A coating needs the concrete surface opened up mechanically to actually key into it. An acid-etched or simply cleaned surface gives the coating far less to hold onto, so the bond is weaker from the start — it just doesn't show until something stresses it.

Hot tire pickup is what finds the weak bond

A tire that's been driven on hot pavement transfers enough heat to soften a weakly bonded coating, and the rubber grabs and lifts it as the car moves. This is why the failure shows up specifically at the tire tracks rather than evenly across the floor — that's exactly where the bond gets tested hardest.

Recoating over the old failure doesn't fix it

Putting a new layer over a peeling one just gives the new layer the same weak surface to bond to, plus loose material underneath it. The old coating generally has to come off and the concrete has to be properly ground before a new system goes on.

What a properly prepped floor does differently

Mechanical grinding or shot blasting opens the surface enough for a coating to actually bond into it rather than sit on top of it. Combined with a system suited to vehicle traffic, that's what keeps a garage floor from repeating the same failure.

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