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Tell me more of this roll on plaster of which you speak.WHS.
PVA is a gift from God.
If you are putting plasterboard over the wall anyway, then seal current surface with watered-down PVA (1 part PVA:5 Parts water, I think, but instructions on the container). Then, PVA plasterborad on top. I use undiluted pVA for gluing - it's a strong adhesive, as long as it remains dry. Else, get waterproof PVA. Oh, you can get roll-on plaster, too, which I found to be a doddle to use and saved me £100s.
I am OK with boarding (I use the dot and dab adhesive) but can't skim for toffee.