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If you prefer peel-and-stick to traditional wallpaper, you can skip the priming process. Many manufacturers don't require an additional primer if you’re installing peel-and-stick wallpaper to painted walls. However, if you’re applying peel-and-stick wallpaper to unfinished drywall, you’ll need to apply a primer first.

In most cases, it is not recommended to wallpaper over existing wallpaper, as the success depends on the type of paper already on the wall. While you might be able to cover non-coated wallpaper, you should never apply new wallpaper over a vinyl-coated one, which is more common. Doing so can lead to poor adhesion, resulting in bubbles, imperfections, and peeling. It can also trap moisture, potentially causing hazardous mold growth between the layers.

Even if the existing wallpaper is suitable, experts recommend applying only one new layer. Adding multiple layers (more than two total) can cause significant adhesion problems, leading to warping and bubbling. For the best results, the recommended approach is to remove the old wallpaper and all paste residue before hanging the new paper. If you are unsure about your wallpaper type, consider consulting a professional.

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.

You shouldn’t need extra adhesive for peel-and-stick backsplash tile. The adhesive on the back of the tile sheets should do the trick. However, if you experience issues with the tile peeling or falling off, make sure the wall you’re working on isn’t textured, as that can prevent the materials from properly adhering.