Hows Rustoleum Epoxy Shield holding up?
I’d say that the short answer is “no”. The killers for adheshion are moisture and smoothness. Smoothness can be rectified by grinding or by the less desireable method of acid-etching. It sounds like you have serious moisture problems. Modern homes typically have a vapor barrier installed under the concrete, so the garage concrete stays nice and dry. The test we use is to tape a piece of clear plastic to the concrete. After one day, if moisture appears under the plastic, then the concrete is “breathing” moisture vapor. Epoxy can’t stay long with moisture vapor pushing against the concrete/epoxy bond. The coating will fail. If you can solve the moisture issue with some sort of drainage issue, and then retest, I think a non-porous coating such as epoxy is possible. You could, however, acid-stain (withOUT a clear coat) because acid stain is porous, the concrete will still breathe.
