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.

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.

To pair a unique sense of style with white walls, keep them well-decorated. Hang vibrant art or bold furniture to add color to the room. Add some texture and greenery to the space with plants. Choose accent pieces such as throw pillows or light fixtures with patterns. Having a white wall can be a plus as it allows homeowners to easily decorate their homes as they desire without worrying about clashing with the paint color. 

Hiring a professional wallpaper hanger is usually a worthwhile idea because, while the application of wallpaper itself is easy, getting the finished product to look good is complicated and takes a lot of practice and patience. A professional wallpaper hanger will not only be able to hang your wallpaper seamlessly, but they will also get an even application of wallpaper paste to avoid bubbling and imperfections immediately and over time. Plus, they can provide their professional opinion on whether to remove or wallpaper over an existing layer of wallpaper.