Can removable wallpaper be painted over?
While removable wallpaper is designed to be easy to remove without damaging the wall, it may not be the best surface for painting. The texture and adhesive of the wallpaper may not provide a smooth, even surface for painting, and the wallpaper may also peel or bubble if painted over. If you want to paint a wall with removable wallpaper, it may be best to remove the wallpaper first, then prime and paint the wall as usual.
Here are more tips about removable wallpaper common mistakes: Common mistakes applying peel and stick wallpaper and how to fix them