Painting over wallpaper that was (mostly) removed ?
If you are absolutely certain you have tried everything to get the remaining paste and paper scraps off---wetting it, steaming it, etc.---and it just will not come off? You are not throwing in the towel too early?
I guess you could prime with Gardz to seal it. Then skim coat to even out those areas so they do not show like linear seams, sand, prime again and then paint.
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