Hi, I've just ripped marlite out of my bathroom and underneath it is perfectly fine condition sheetrock. I pulled off a couple sheets where I plan to put put cement backer board & tile before I spooked from the thought that old sheetrock sometimes contains asbestos. The house is from 1915 but was substantially remodeled in the 30's and had later updates. So I couldn't say what decade the sheetrock is from. It looks like there was plaster there before they ripped it out and put in sheetrock & marlite.
Either way, rather than ripping the rest of it out, I'm wondering if I there is something I can paint it with to preserve it for years to come. Maybe an oil-based paint?
Any thoughts are appreciated . . .