My kitchen tiles have been up since the 70's & the glue used is brown & won't come off short of taking down the sheet rock. I don't want to get into all of that. Can I plaster over it? I thought this might smooth it out enough & stay thin enough so I can put up something else without moving the electric boxes Has anyone ever used waterproof wallpaper? I am not ready to install anything permanent and thought this would work in the interim.