If you don’t prep the wall correctly, the wallpaper beneath it can peel and lift. The wallpaper seams (and even textures of the wallpaper itself) can show through the paint. Depending on the ...

The following instructions are for non-woven (also called “paste the wall”) wallpaper ... over a dark color that could show through the wallpaper, sanding down any lumps of old paint, and ...

Be careful not to score the wall too aggressively though ... suggests using course sandpaper to scratch through the layer of paint protecting the wallpaper. Once some of the film has been cut ...