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Whether you skim coat the entire wall or just a portion depends on the extent of the damage. If you only have small sections of gouges, a targeted skim coat will do the trick. However, if the surface feels uneven across larger areas, a full skim coat produces a smoother, more uniform result and helps prevent a patchy-looking paint finish.

It depends: You can wallpaper over non-coated wallpaper, but you should never wallpaper over vinyl-coated wallpaper. This non-recommended method will cause the new wallpaper to fail to stick, which can lead to bubbling, imperfections, and even mold growth between the layers of wallpaper. Consult a professional wallpaper hanger to determine your existing wallpaper type or remove the current wallpaper and paste residue so that the new wallpaper will adhere properly.

For the most part, peel-and-stick wallpaper doesn't damage walls. However, there may be some cases when damage does occur. For example, if you try to rip the paper off the wall, you may pull away some paint at the same time.

The walls can also be damaged if they aren't prepared properly before you add the wallpaper. For example, if the coat of paint is too fresh when you put the wallpaper on the walls, it can peel away as you remove the paper. 

You can paint over existing wallpaper if you select wallpaper that is designed to be paintable. This type of paper is meant to add texture to walls. Alternatively, if you have old wallpaper you’d like to cover up, you can often paint over that instead of removing it. However, it needs to be smooth, damage-free, and non-textured. Otherwise, any bumps, tears, and texture will show through the paint.