hi, I am currently in the process of decorating my house. the house has been recently extended and all waals were skimmed. I have a problem with bubbles appearing on the ceiling which tend to peel off. I have used PVA adhesive but still cannot rectify. it only affects one part. may i also inclue this is the area that was recently revamped and that there cannot be dampness due the flat roof just recently done by contractors. Help please.. this is holding up my other jobs.