Prepping a wall for wallpaper (again)?

[stuartb3502]

I've seen some threads about prepping and have tried to research as much as I can, but I'm still a bit stuck.

House built 2001. When we moved in, it had paint on walls from the builders. We subsequently had it wallpapered That's been on 20 years. We've stripped that quite easily (peeled top layer, sponged, the rest came off clean). Very little paint came away.

I've painted the majority of the room, and I'm trying to wallpaper one wall with paste the wall adhesive.

I got a couple of sheets on. When I lifted to reposition, I found that the paint was bubbling and coming away with the paper. The walls appear to be plasterboard underneath. There is a plaster or compound skimmed in places. That's only where the paint has lifted and I can see. Pictures attached.

What to do? Is there a way to seal and stabilise this or do I need to get the paint off and then perhaps mist coat, paint or apply another sealer?

I'm not that familiar with this stuff, but happy to read up further if pointed in the right direction. So if anyone can point me towards method(s) and any specific products that would be awesome.

Thank-you
Stuart

 

[Wayners]

Get the paint off. Use glass scraper or sharpen a scraper..
You can also use a wallpaper scraper with those razor shape blades...
Gardz
Make good with toupret filler
Sand
Gardz
Emulsion wall with paint that matches the paper colour
Wallpaper wall.

 

[stuartb3502]

Thanks Wayners, will give it a go.

 

[stuartb3502]

Quick follow-up....

I found that the bulk of the paint was actually rock solid. I tried sponging it and various scrapers.

It was just where the builders had used compound over joints and screws that there was an issue. I removed those areas. I then used Zinsser Peel Stop, first on the exposed spots and edges. Levelled up with Toupret fine surface filler. Sanded those flat, then lightly sanded and cleaned the whole wall again. A 9" circular sander on a pole has been a good energy and time saver throughout the redecoration of our lounge (used for ceilings and walls).

Then, after checking with Zinsser, I used Peel Stop over the whole wall. I understand that other primers (probably Wayners recommendation of Gardz for example) or sizing may have been just as good/better for this, but I had the Peel Stop to hand.

I got a sample pot of paint colour-matched to the wallpaper background colour and used that to paint where the joins would be on the drops.

I think that some of my original problems were down to:
a) Not priming or sizing the wall (made the error of thinking that, because it had been wallpapered before, it wasn't needed)
b) Inexperience of wallpapering (only done once before)
c) Combination of higher temperatures and not applying enough paste to the walls to give working time (taking into account b) )

Managed to get it on OK now. Not 100% happy with the first couple of drops because of some visible edges which only became apparent a little later, but later drops with more paste, allowing for a bit more slip, are very good.

I'd spent a long time trying to learn about how to hang, trim and deal with obstacles, but not enough learning about wall prep.

Thanks again Wayners for your help - I was completely stuck (unlike the paint ) before that.