The previous homeowner was a do-it-yourselfer that should have hired help for every project he completed in our home. It seems that in one of our bathrooms he improperly installed a tub surround over damaged drywall to hide the problem. The damaged drywall is loose and is crumbling into the tub because there isn't any grout left between the surround and tub. The surround itself has many large air pockets behind it. We know we need to strip everything down to the studs and replace the backer board, but we can't afford to remodel this bathroom for another few months.
Can you reccommed a temporary fix to seal the gap where the grout should have been? When I tried to remove the old caulk and loose wall particles hanging from under the surround, I may have made matters worse. There seems to be no end to the loose material. We have to continue to use this shower for 3-4 more months? Any suggestions?