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painted over wallpaper adhesive

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we have 2 bedrooms that were wallpapered, they removed the paper, but not all the adhesive, and painted over it..he tried to skim coat but the stuff bubbled, not he wants to scrape all the areas we can, THEN drywall...or skimcoat what ever you call it. Is there a quicker way to not have the skimcoat bubble??? and not have to scrape all that stuff off?