Moisture pushing up through the slab
Florida’s residential code doesn’t require a vapor retarder under a garage slab, and the water table here sits close to the surface. Moisture rising from below lifts a coating from underneath, usually in white, blistered patches.
Fix: test first, then use a moisture-tolerant primer where the reading calls for it.
Hot tires off summer asphalt
Tires coming off hot pavement can soften a thin, low-grade coating. The coating grips the tire and peels away in the shape of the tread, a failure called hot tire pickup.
Fix: a ground surface, a full-build system and a hard polyaspartic or urethane topcoat.
Sun through an open door
Plain epoxy ambers under UV light. In a Florida garage the first few feet inside the door get the most sun, so they change color first and the floor ends up two-tone.
Fix: a UV-stable topcoat over the base coat.
Poor surface prep
Acid etching and roll-on kits leave a smooth, weak surface for a coating to hold. Most early failures trace back to prep, not the product.
Fix: diamond grinding to open the concrete before the first coat.