 That's when you want to go through and skim coat that wall. You can put some of these thicker wallpapers up behind it as a backer to cover up that texture and then put another wallpaper over the top of that. So that kind of hides that wall texture behind it. But to me, it's almost easier just to go ahead and skim coat that, sand it down, prime it, put a coat of paint on it so it's sealed up.