I *know* this is a stupid question, but ...
I'm going to dot and dab fresh plasterboard over an internal wall, to deal with various gaps, holes, and the nib of another wall that used to join it. Quite a lot of the wall has wallpaper on it. Am I being daft if I dot and dab over it, without removing the paper first (with, or without PVA)? I could do without another unnecessary job.
Cheers Richard