We have had a fun couple of days with this. I had finished painting the left-hand wall, and had a bit of paint left in the tray so I used it to paint a small part of the back wall. Later that evening I looked at it and it appeared to be bubbling. So I touched it with my finger and basically the paint came of like a jelly.
The next morning: I looked at it more closely and realised that the two walls that had the wallpaper on, was still covered with wallpaper paste and I had basically painted over the top of wallpaper paste. We had sugar soaped the walls, but all we were really doing was turning the paste back into liquid and spreading it over the wall. I dealt with it in the way I learnt from my father, much ranting and many expletives, that didn’t resolve the issue but it made me feel better 😜
Searching on YouTube and Google for ideas as to what we could do didn’t really provide anything so I took a drive into a well-known DIY store. There I spoke to one of their painting experts and he, quietly, told me what I needed to do. I am not going to say what he said on here, as he probably should not have done so; needless to say we had all the windows open, double masked and rubber gloves were worn.
I said to Carole last night that I was worried that it still hadn’t moved it but to make sure I would get some cheap white emulsion and paint the blue walls; which is where the wallpaper was. Carole got called into work this afternoon to cover a shift and I have taken the opportunity to do exactly that - the walls are white and hopefully it’ll dry okay overnight and I’ll be able to put the new paint in the surfaces without any more issues.
Oh my word! I don’t even remember how my contractor got the glue off the wall when he stripped my kitchen wallpaper off. Maybe he sanded it off? Well I’m glad you have gotten it under control.
When we bought our house int had wall paper everywhere. So instead of removing it, we had someone paints over it with a special layer that almost gives it a "new wall" Probably what you are doing now :) ...good luck!
What a chore this has turned out to be.