I am recessing a painted wood framed mirror over a vanity. It will need to be caulked all around before the walls are painted. But I want to have the option of removing it at a later date without damaging the painted frame when I remove the caulk. Does anyone have any suggestions on something I can apply to the mirror (an acrylic varnish maybe, or candle wax) before mounting it that will make caulk removal easier? Or some removal process or type of caulk that would remove without damaging the painted finish on the mirror frame?