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I believe my bathroom has wallpaper that was painted over by the previous owners. There is a small section of wallpaper that was never painted over, so I know it was at least installed on one wall. However, the opposing wall does not necessarily show an indication that there is wallpaper under the paint. How should I test the walls to make sure that any and all wallpaper has been removed before repainting? Will I damage the drywall if I proceed assuming all of the walls have wallpaper on underneath the paint? I definitely want to take off any wallpaper because there are a few spots in the paint that are peeling up and I don't want to have problems down the road.

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jab a knife in it and if you can peel a layer of paper away it is either drywall or wallpaper :) –  ratchet freak Jan 27 at 16:30

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