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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. 

How long peel-and-stick wallpaper lasts depends on a few factors, including the conditions in the room, the quality of the wallpaper, and the wallpaper's application. As a general rule, peel-and-stick wallpaper can last for at least five years, but you may decide to remove it sooner. Under ideal conditions, it can also last for much longer.

Factors that may shorten the lifespan of peel-and-stick wallpaper include high humidity in a room (such as a bathroom), dirty walls, and low-quality paper.

You can paint over existing wallpaper if you select wallpaper that is designed to be paintable. This type of paper is meant to add texture to walls. Alternatively, if you have old wallpaper you’d like to cover up, you can often paint over that instead of removing it. However, it needs to be smooth, damage-free, and non-textured. Otherwise, any bumps, tears, and texture will show through the paint.

You can paint over wallpaper, but it’s not usually recommended, especially if the wallpaper underneath is textured or dirty. If you do decide to paint your wallpaper, make sure it’s in good condition and clean it very well. Make sure all corners and edges of wallpaper are glued down before you paint, as well.