I used a chemical stripper to remove the old wallpaper and it worked well. So well, in fact, it removed some of the paint that was on the wall behind the wallpaper. So I’m left with walls that are either paint or exposed drywall. It’s a bit rough. I purchased a heavy grass cloth paper to put up. Can I put it on the walls as is? Or will I need some sort of skim coat of spackle to even it out? I’d really like to avoid the mess of the skim coat if I could. Any advice?