(This is the same room I posted that the ceiling had ridges if you read that. Took 3 days but the finally agreed to float the ENTIRE ceiling. Not sure of the ruggedness of THAT mud but have no reason to touch it.) Used Behr Premium. 2 coats over new drywall done by a contractor. (I DO have doubts he sealed the drywall AND I believe he mixed his mud too dry in a naturally cold room) which they also cut the heat too. Where mud was liberally used the wall will fall off if touched firmly. No ****! What do I do? I cant re-mud. Am I stuck back at square 1 to rip ALL the drywall and start over? I want it done right. Cost is no hold back.