Trouble with high suction patches


New Member
The plaster has blown on different patches on some of the walls in my house, under the plaster is old, and very very dry sand & cement render. I have tried doing 3+ coats of PVA on these areas but when skimming over them they dry up the plaster near instantly.

What do you recommend for things like this? I was thinking that something like bitument paint would seal these high suction patches off before skimming, I'd rather not buy a 5L tub of SBR/bluegrit if I don't need to.

Could it work to just bond these patches a short while before skimming?