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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. 

No. If you overlap seams, the wallpaper will not come out flat. In addition to possibly throwing off your pattern match between rolls, overlapping seems necessary. If wallpaper is properly acclimated, and temperature and moisture conditions are optimal during installation, there is no reason to fear shrinkage as it dries.

There can be too much of a good thing when it comes to accent walls, so avoid creating one in every room in your house. Some rooms, like bathrooms and kitchens, don’t naturally lend themselves to accent walls, so it’s best to skip them there. Of course, your home should reflect your own sense of style, so if accent walls in multiple rooms appeal to you, there’s no hard-and-fast rule forbidding it.

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.