I just came from an estimate where a regular customer of mine had her bathroom remodeled. The guys that intalled the tub surround used an unpaintable caulk and now I'm expected to apply a wallcovering in this room. I'm not certain that I can get the caulking off the drywall, nor am I certain that I can get it cleaned up off the surround. Someone once told me apply a coat of rubber cement over the caulk and that would allow paint to bond to it. I've never tried it, and I'm uncertain that wallpaper would bond to it.