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We don’t recommend wallpapering over older paper. That’s because creating layers of glue can invite bubbling or excess moisture on the wall’s surface. You should also prime your wall before applying wallpaper and smooth the wall as much as you can, and another layer of wallpaper complicates this process.

Most experts would not recommend hanging wallpaper over existing wallpaper more than twice. Even if the walls are in good condition and primed well, that third layer of wallpaper could cause problems with adhesion. Unless you like bubbling paint and peeling wallpaper as an interior design choice, it’s better to remove at least one existing layer before adding any more to a wall.

Once again, contact with moisture is the culprit here, though water-resistant varieties of wallpaper are less likely to become wet and develop mold. Using a high-quality exhaust fan or dehumidifier and leaving the doors or windows cracked after bathing will keep this issue at bay. 

Painting over wallpaper is an efficient way to cover it if it’s in decent shape. Before painting over wallpaper, make sure the surface is clean and smooth. You may have to remove minor problem areas, such as lifted seams or small peels, with a sheetrock knife or putty knife. Add a latex- or oil-based primer to keep moisture at bay before painting. You’ll likely need two coats of paint to cover the area.