Sorry for reposting I posted a couple of days ago but didn’t get very far because my pics wouldn’t upload. what would be the best way to fix up this blown plaster? I think it’s blown when I stripped the wallpaper due to the steamer and the wall being damp in those parts. I don’t know why it’s damp, I can’t seem to find a source, maybe the cavity wall insulation or the wet moss on the tarmac drive that runs on the outer wall which I will scrape off this weekend. How can I patch it up and treat any damp as best I can so it will be ok to paint over?