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No, you don’t always have to remove old wallpaper before applying a new layer. However, you should pull off the existing wallpaper if it’s cracked, peeling, or in poor condition. We’d also recommend against putting wallpaper over textured or dark-colored wallpaper because the old layer may be visible through the new one. In addition, if you try to hang new wallpaper over vinyl-coated wallpaper, the adhesive might not stick properly. 

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.

In most cases, you cannot wallpaper over existing wallpaper. It’s possible to wallpaper over non-coated wallpaper, but vinyl-coated wallpaper is much more prevalent in homes, so you generally shouldn’t put new wallpaper over existing wallpaper. Adding a layer of wallpaper over vinyl-coated paper will lead to poor adhesion, leaving behind bubbles and imperfections in your wall. Plus, wallpapering over vinyl-coated wallpaper can lead to mold growth, which can be hazardous to your health. It’s usually best to hire a local wallpaper removal service to handle the task to avoid these issues.

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.