I am a painter, maybe I can help here.

Different epoxy paints have different uses, Some are elastic and will
streach and give with movement such as expansion and contraction of the
cement, others will harden brittle but can shrink as they harden or with age
this can cause it to pull away from surfaces that they do not bond well
with, Both kinds have properties which will cause it to fracture when "HIT"
and this can also cause it to peal.

Ceramic tile and primed steel as well as enameled surfaces are ideal
surfaces for epoxy paint and is will last a long time on these surfaces, but
wood and concrete need paints that are designed for use on them.

Concrete should (read as must) be treated with Muric acid before painting as
this will kill the lime that migrates to the surface and causes even
concrete paint to peel.

Hope this helps.

Donald

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