What the?!?

[hendrix88]

Ok, so to summarise:

Skimmed two walls, noticed after 20-30 mins or so that the plaster was becoming uneven, like it wasn't bonding to the wall and started to sag. I kept working it, and eventually got a flat finish.

So I was checking it last night and started to tap a few areas, noticed it felt hollow, like it had blown. Couple more taps, and sheets of the stuff started coming away.

Took it all down and started again. I completely keyed the walls, PVA'd twice. Skimmed whilst PVA was nice and tacky. Same things happened.

So I'm considering boarding the walls now, but before I do. Does anyone have any ideas as to what's happening and what I'm doing wrong?

Cheers

 

[hendrix88]

Should also add that the walls were painted, with this horrible thick like gloss paint.

 

[Alastairreid]

Should also add that the walls were painted, with this horrible thick like gloss paint.

Theres your answer.

pva controls suction..you should have used This stuff.

 

[hendrix88]

Should also add that the walls were painted, with this horrible thick like gloss paint.

Theres your answer.

pva controls suction..you should have used This stuff.

Thank you! - Will order some.

Guess I've got another horrid job of scrapping it all of again once it's dry. Bloomin' stuff.

 

[mac391]

Plastering sand or fine sharp sand mixed with pva works ..

 

[jrplastering]

that could work mac the problem is pva is water soluable so even if you have put sand into it as soon as you apply your plaster it will liven right up and then it willl still struggle to stick to a gloss paint.
im guessing the link was to a bonding agent which has to be left to dry before its skimmed and to my knowledge it does not liven back up thus createing a completley new surface to skim onto with plenty of key