Any tips? My house is almost 50 years old. My bathroom redo I've found the paint is cracking in several areas. When I moved in there was wallpaper. I stripped it off. Scarping and washing with soap and water. I then gave it a coat of semigloss. New wife didn't like it an we gave it a coat of killz to help in coverage. Now in several areas it is cracking. I know with cars you have to remove it all. Is it the same with sheetrock? Any tips appreciated. Thanks.