1-1/2 years ago we installed a larger ceiling exhaust fan in our bathrm (just outside of the shower door) as paint was peeling off the 7 ft. ceiling and wall! We were told it was caused by "hot plaster". As I recall we put a coat of Bin and several coats of high gloss Benjamin Moore paint. We are once again faced with the same problem and need to know how to correct it! We have now ordered a Humidistat fan and feel we'll need to install a new piece of drywall for the ceiling or use Marlite. Are we on the right track? A solution to this vexing problem would be greatly appreciated.