Reading The Failure
Bubbles and blisters, or a coating that lifts off in one clean sheet, almost always mean moisture from below. On Sarnia clay that is the most common failure we see.
Flaking that starts at the edges and works inward usually means the slab was etched rather than ground, so the resin never keyed in.
Chalking, dulling and colour loss on a floor near a window or door means clear epoxy has been hit by ultraviolet light. It has yellowed and gone soft.
Coating pulling up in the shape of a tyre is hot tyre pickup, and it means the top coat was too soft for a parked vehicle.
Wear through to grey at the traffic lanes, with the rest sound, is simply an old floor that has done its job. That one is good news.
What Recoating Actually Involves
The old system is ground off. There is no shortcut here and anyone offering one is selling you the same failure again.
The exposed slab is tested for moisture, properly, in the slab.
Concrete is repaired: cracks cut and filled, spalling rebuilt, pitting ground flat.
A primer is chosen against the reading, not against habit.
The replacement build is chosen specifically to beat whatever killed the first one.
When A Scuff And Recoat Is Enough
None of that applies if the floor is still stuck down and it is only the wear layer that has gone.
We abrade the surface, clean it and apply a fresh top coat. It takes a day and costs a fraction of a full rebuild.
Telling the two apart is the useful part, and a photograph usually does it.