Old concrete pad aprox 4" thick. Heavy clay below. Aprox 40m2.
About a year ago, it was selaed with a Silka product (though I forget which) and then screeded with self leveling compound.
It was then coated with damp tolerant epoxy primer, folllowed by two coats of high build epoxy garage foor paint from the same manufacturer (not Silka).
A year on, a blister has appeared in the epoxy about 4" in diameter. The next day the blister had burst and water had seaped out.
Presumably a new crack in the concrete has allowed moisture to get through.
At the moment there are no significant cracks / tears in the epoxy coating, probably only a pinhole, but unfortunately it is in a high traffic area and if left it is likely to all peel away.
Any suggestions on how to deal with this?
I wondered about getting hold of a hyperdermic needle and injecting some sort of adhesive under the blister, but I can't think of anything that would be thin enough and that would work in potentially wet conditions.
About a year ago, it was selaed with a Silka product (though I forget which) and then screeded with self leveling compound.
It was then coated with damp tolerant epoxy primer, folllowed by two coats of high build epoxy garage foor paint from the same manufacturer (not Silka).
A year on, a blister has appeared in the epoxy about 4" in diameter. The next day the blister had burst and water had seaped out.
Presumably a new crack in the concrete has allowed moisture to get through.
At the moment there are no significant cracks / tears in the epoxy coating, probably only a pinhole, but unfortunately it is in a high traffic area and if left it is likely to all peel away.
Any suggestions on how to deal with this?
I wondered about getting hold of a hyperdermic needle and injecting some sort of adhesive under the blister, but I can't think of anything that would be thin enough and that would work in potentially wet conditions.
