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Many types of peel-and-stick wallpaper can hold up to environments with some level of moisture, such as bathrooms—especially peel-and-stick wallpapers made of vinyl or polyester. However, if you’re considering wallpapering a bathroom that sees a lot of moisture, like a kids’ bathroom or a full bathroom with a steamy shower and inadequate ventilation, even the highest quality wallpapers will peel.

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 wallpaper and paint over certain types of wallpaper, but it’s usually a better idea to remove it first. Removing the wallpaper and prepping the wall before painting is a good way to guarantee a smooth finish that looks professional. If you ever have a moisture or water issue after painting over wallpaper, the paper will bubble and damage your wall. Additionally, you should never paint over wallpaper already peeling or otherwise damaged, as this will leave obvious imperfections in your wall and could lead to additional problems.

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.