When the paper on drywall has been torn, the edges tend to have little fibers that never seem to go away even though we plaster, sand and paint.
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Freezing those fibers with shellac should be all the priming you need to do. If your bathroom is humid enough to be swelling the drywall I think you need an exhaust fan and/or dishumidstat more than special primer paint.
Hi Jon,I have several places on my bathroom drywall that are torn and/or waffled. I recently removed old wallpaper. If I apply the shellac,let it dry,sand, and then put joint compound or spakle on it, sand gain and prime, should it be okay to then paint?I have read that I need either an oil based primer or Zinsser Gardz High Performance Sealer, to solve the drywall bubbling issue before I paint. My plans are to use a final coat or latex paint semi-gloss. What are your thoughts? Thanks, Brad
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