A job i am leading up to has the prep for stone and my parts beng done in advance, not by us. Under the architects spec they are applying Mapelastic to the backgrounds, which apparantly is coming off, thus holding back the stone and tile install and causing problems. Not my call to solve it and haven't seen the problem (its a big enough project with lots of suits) but just wondered if any others on here with Mapelastic specific tales. I use Ardex mostly, have used Mapelastic occasionally without problem.