How to Remove an Epoxy Garage Floor Coating

Removing an existing epoxy or polyaspartic coating is necessary when the coating has failed, when you want to change systems, or when a new contractor insists on starting fresh over a previously coated floor. Here's what the process involves and what to expect.

Why You Can't Just Coat Over a Failed Floor

Patching a delaminated area or applying new coating over a failing one is tempting but usually fails again quickly. The bond between new coating and old coating is weaker than the bond to bare prepared concrete. You're adding another layer on top of a compromised surface — the failure mode remains and propagates. Full removal is the correct approach for a coating that's actively failing.

Professional Removal Process

The professional standard for coating removal is aggressive diamond grinding — the same equipment used for prep, run repeatedly until all coating material is stripped and bare concrete is exposed. This process:

• Removes the full coating system to the concrete surface
• Profiles the concrete (creates mechanical tooth) for the new coating in the same operation
• Generates significant concrete dust — industrial vacuuming is required throughout
• Takes several hours for a standard 2-car garage

Can Chemical Strippers Remove Epoxy?

Chemical strippers work poorly on cured epoxy and polyaspartic systems. These coatings cross-link chemically into a hard thermoset — solvents and strippers can soften the surface slightly but won't penetrate or remove a well-bonded coating. Grinding is the reliable method.

What We Do After Removal

After full removal, the slab is clean, profiled concrete — in the same condition as a properly prepped new install. We then coat with our standard polyaspartic system. The result should last another 15–20 years.

Also see: Why coatings peel → | When to replace →