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You should always use a primer before painting over wallpaper to help the paint adhere correctly and get a good finish. Not all wallpaper can be painted over, so do a test patch in an inconspicuous area before painting an entire wall. If the primer and paint don’t adhere, you’ll need to remove the wallpaper, prime the wall, and then paint.

Your peel-and-stick wallpaper can fall off for multiple reasons, including high humidity levels, extreme temperature changes, poor installation, and even the wall surface. Textured walls can prevent the adhesive from fully sticking to the wall, making it more likely for the wallpaper to peel off. Low-quality wallpapers with weaker adhesives are also more likely to fall off prematurely.

For the most part, peel-and-stick wallpaper doesn't damage walls. However, there may be some cases when damage does occur. For example, if you try to rip the paper off the wall, you may pull away some paint at the same time.

The walls can also be damaged if they aren't prepared properly before you add the wallpaper. For example, if the coat of paint is too fresh when you put the wallpaper on the walls, it can peel away as you remove the paper. 

You can paint over wallpaper if it’s smooth and in good shape. But if there are bumps or tears in the wallpaper, they’ll likely show through the paint. Similarly, you should avoid painting over textured wallpaper because the ridges and patterns in the paper will be visible. In either of these situations, you should remove the wallpaper before painting.