I'm trying to clean up a painting mess where a friend's tenant painted latex over oil in a couple of rooms. The latex coat was applied maybe 18 months ago. This spring my friend (aka my attorney) asked me to fix the peeling paint in the kitchen and that was weeks of sanding/stripping. I found latex over oil, over wallpaper and glue, layers of spackle and even ketchup stains in the wall. No prep at all just a mess. Eventually I got the paint surface to a reasonable state and put a zinsser oil primer down and then painted.
The bathroom was fine 6 months ago and now a peeling mess. Sanding and scraping have removed most of the loose paint, I've hit the wall with a belt sander and heat gun. Underneath there's glue, wallpaper, and maybe 4 coats of paint (yes lead is there I'm sure). But the top coat of latex is mostly gone.
My question is I have to assume there's damage to the paint underneath, right? I've no guarantee that prepping/painting on top will maintain since the latex has been tugging at the oil layers underneath? I'm assuming much of the underlying coats will need to come down?
Maybe the simplest thing is thin drywall on top of everything else. Any advice welcomed here.
My attorney is an awesome dude, takes me out to dinner often and fishing a dozen times a year. So very hard for me not to help when he asks.