Can an Old Peeling Epoxy Floor Be Recoated or Must It Come Up

Two floors that look equally tired from the driveway can need very different repairs, one a light scuff and recoat and the other a full grind, as the notes at epoxy floors riverside zozanga describe. A tired epoxy coat in Riverside, CA tells its own story if the failure is read at the edge of the damage. The cause decides the fix, not the look.
How can peeling be told from wear?

Peeling shows a clean, shiny underside on the lifted piece, while ordinary wear shows a dull, scratched surface still bonded to the slab. Clean undersides mean the primer never gripped, usually from moisture or poor prep. That kind of failure cannot be recoated, because new material would peel away with the old.
What causes hot tire pickup?

Hot tire pickup happens when a warm tire softens a coating that was cured too quickly or applied too thin. Summer garages in the Inland Empire push surface temperatures high enough to make it worse. A polyaspartic topcoat resists the heat far better than a standard epoxy surface, so recoating with one often solves the problem. Lifted patches beneath the tire footprint point to moisture instead, and that needs a vapor test before anything new goes down.
When does a scuff and recoat work?
A scuff and recoat works when the old coating is firmly bonded and the damage is limited to a faded or chalky topcoat. Chalking comes from sunlight breaking down the resin at the surface, and yellowing from the same cause. A light abrasion with a screen pad, a wipe with solvent and a new clear coat renew the floor.
When must the coating come up?
The coating must come up when it lifts in sheets, blisters over wet spots or sounds hollow when tapped. Diamond grinding removes the old film and exposes clean concrete, after which crack repair and a fresh primer follow. Grinding is slower and louder, though it is the only way to start with a sound bond.
What is the summer cure window?
The summer cure window in Riverside, CA is early morning, because slab temperatures climb quickly after ten. A product with a short pot life can gel in the bucket before it is rolled out. Working near sunrise gives a clear coat the time to level, and a cool slab keeps the base coat from outgassing and leaving pinholes. By midday the same pour would cure too fast to level, which is how roller marks get locked into the finish.