I have a 20cm hole in a wallpapered wall.
Can I get away with filling the wall with plaster, then painting over it, without stripping the wallpaper off the entire wall first?
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Shmoo shapes are best. (What's a Shmoo you ask?)
Textures may not match.
If you need more tips on the plastering / mudding part, let us know. Compounds come in different packaging (bags, tubs) and types (setting vs drying), and some are better for this task than others.