Masked ceiling and walls around door I spray painted. When I pulled the tape (usual medium release), some of the paint and underlying texture came right off the drywall leaving it smooth. I've never seen well cured mud come off drywall like this-paint and all. What the heck happened? One drywall guy said the drywall should have been primed first. I know the job was USG product, applied skip troweled by a pro. I'm afraid if I start probing for more loose stuff, I'll end up remudding and texturing the whole ceiling!I'm the painter not the plasterer.