One easy trick is to prime all new sheet-rock surfaces with an oil based primer. Some of the ones mentioned above in posts work well, but steer clear of Kilz as a primer. I have also seen it come off in sheets (along with the finish paint).
When I redo bathrooms, I have had to often tear out old rotted sheet-rock. When it is that bad, I try to use DuRock (cement board) as the base. It is absolutely impermeable to water vapor and holds tile very well.
If I don't have the time/resources to do tile (at that point) I have used the inexpensive plastic shower boards from HD/Lowes that work well. Very quick to put up.
Redoing bathrooms sucks as you often need to use it while you are redoing it. My wife has "claimed" one bathroom here and I get the other dumpy one. God help me if I tread in "her" bathroom or god forbid that I take a shower in there. I am likely not the first spouse that has noticed women's claim of a bathroom.
Hang in there.
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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