twitcher
Private Member
Alright, PVA again 
This time I wanna ask does anyone know why wet pva seems to weaken bonds?
Think it's already been mentioned on here that wet pva will weaken set board addy. If you brush wet pva on some hardened board addy stuck on a wall, it'll weaken the bond and make it easier to hack off. Whereas if you brush pva on a wall to be dabbed and let it set it'll strengthen the bond of the board addy to the wall.
Also been thinking that the sheets of skim falling off artexed ceilings scenario might relate to this too. It looks like everyone who's had it sheet off has all used PVA on the artex before it was skimmed. So is the wet pva weakening the bond of the artex and causing it to fail? Whereas if you use a polymer based plaster bonding agent like WBA it won't happen. WBA won't weaken the bond like wet pva.
What do you reckon? Am I talking bollox or what?

This time I wanna ask does anyone know why wet pva seems to weaken bonds?
Think it's already been mentioned on here that wet pva will weaken set board addy. If you brush wet pva on some hardened board addy stuck on a wall, it'll weaken the bond and make it easier to hack off. Whereas if you brush pva on a wall to be dabbed and let it set it'll strengthen the bond of the board addy to the wall.
Also been thinking that the sheets of skim falling off artexed ceilings scenario might relate to this too. It looks like everyone who's had it sheet off has all used PVA on the artex before it was skimmed. So is the wet pva weakening the bond of the artex and causing it to fail? Whereas if you use a polymer based plaster bonding agent like WBA it won't happen. WBA won't weaken the bond like wet pva.
What do you reckon? Am I talking bollox or what?