My garage floor was in poor shape (cracks, stains, chipped). I got it coated with polyaspartic coating, which is great. Since then, I've noticed it has sunk in several places (it may have been like that before I got it coated, but tbh I'm not 100% sure).
I've read that expanding foam injections can be used to level concrete slabs. Is it possible to do this with a floor that's been coated as mine has? I read that if you cut relief joints, it is possible, but I would like to hear from people who are in the business whether it is feasible. #home source