The floor was crisp gray with white flake. Now it's beige, and worse near the door. That's UV amber, and every epoxy clear coat does it under Utah sun. The fix is chemistry, not cleaning.
Epoxy and aromatic urethanes are not UV-stable — the resin chemically ambers under ultraviolet light. At 4,500 feet with 300 sunny days, a garage door open on weekends delivers plenty. The yellowing is inside the resin, so it can't be scrubbed off, and it's worst in the strip nearest the door.
Our topcoat is an aliphatic polyaspartic, which is UV-stable by design. The flake beneath it is color-fast vinyl. West-facing garages, patios, sunrooms and porches all stay true to color. It's the same reason we won't put an epoxy clear on anything that sees sun.
If the floor is sound and just yellowed, we can sometimes scuff and recoat it with polyaspartic. If it's a thin epoxy that's also peeling or chalking, we grind it off and install the full system. We'll tell you which after looking at it.
If it's well-bonded and thick enough, yes — scuff and recoat. The amber base color will still show through a clear coat, so it works best with a fresh flake broadcast over a new base coat.
The epoxy body coat in a metallic can amber under direct daily sun, which is why we recommend metallics for interior spaces and closed-door garages.
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