An epoxy floor is a two part resin coating trowelled or rolled onto concrete, where it cures into a hard, chemically resistant surface bonded to the slab. It is the most widely used resin floor in British garages and workshops because it is durable and comparatively cheap, and almost every failure of one comes from the same two places: the slab it was stuck to, and the conditions it was laid in.
What it does well
Epoxy resists oil, fuel, most solvents and the abrasion of a car being driven onto it. It seals a dusty slab, which is often the real reason a garage owner wants one, and it can be finished with broadcast flake or quartz for grip and to hide dirt. In a workshop or a plant room it is easy to clean and easy to see spills on.
Where it is the wrong choice
Epoxy is comparatively brittle, so a floor taking heavy impact is often better in a polyurethane. It ambers in strong ultraviolet light, so a floor with direct sun on it needs a topcoat that does not. And it cures badly in the cold, which in an unheated British garage rules out a good part of the year unless the space is warmed.
Why the slab decides
Resin is a coating and a coating is only as good as its bond. A slab that is damp, still curing, dusty, oily, sealed or previously painted has to be ground or shot blasted back to sound concrete first, and moisture rising from a slab with no damp proof membrane will lift a coating however well it was applied. That is why a moisture test and a preparation line belong in every honest quote.
Questions people ask about epoxy floor
How long does an epoxy floor last?
A well prepared, correctly specified floor lasts many years in domestic use. The variable is preparation rather than product, which is why the cheapest quote is often the shortest lived.
Can I put an epoxy floor down myself?
Kits exist and the resin is the easy part. The preparation needs a grinder and dust extraction, and the resin has a working time measured in minutes, so the two things an amateur is short of are exactly the two the job needs.
Is it slippery?
Plain epoxy is slippery when wet. Broadcast aggregate or a textured topcoat gives grip and is normal where a floor gets wet, which is a specification choice to make before the quote rather than after the first fall.