Blistering emulsion driving me nuts.

Minstadave

Minstadave

Minstadave

Caporegime
Joined
8 Jan 2004
Posts
33,042
Location
Rutland
Moved into a new house a month and a bit ago, started decorating having very minimal past experience.

I've hit a problem with the first room. Tried to paint over the matt white emulsion on the walls with some Dulux matt. A few raised areas came up, put a second coat on to see if they'd be noticeable and more came up.

Small blisters around 5-10mm came up. When you poke them it all comes away leaving bare plaster board.

I've scraped all the worst areas back to plaster, sanded and put some Dulux plaster sealant then polyfilla on which does the trick for that area, but then when I wipe the walls down to paint bubbles come up in the untreated areas without fail.

Anyone come across this before? Am I just going to end up completely stripping the walls back to plaster?
 
If you're painting straight onto plaster you need to use a coat of watered down white emulsion first so that it sticks properly. There are products that help create a sticky layer however that should do the trick - give it a quick google :)
 
I'd tried just pairing on the old emulsion first which isn't working as it just blister.

Trying to decide weather to strip the whole room back to plaster or just keep treating the troublesome areas.
 
Could you try test the plaster by painting water on the bare plaster? If it's not getting absorbed pretty quickly then the plaster has been sealed - usually with pva. Probably best asking in a decent diy place on how to get the paint to stick.
 
I had this where we stripped wood chip off and was lazy and left some of the latent glue on the board. Had to make sure we washed all the paste off the next time.

We used green scouring pads and changing the water over and over again.
 
Had something like this earlier in the year but it could be different.

The wet paint I was putting on was causing the old paint (which was actually new from the last owners a year before) to swell up as bubbles as it wasn't bonded to the plaster behind properly. Attacking the old paint more vigorously with a palette knife resulted in it coming off in huge sheets with traces of black mould between the plaster and paint sheet.

Much paint stripping, scrubbing and sealing of plaster later it has two coats of silk paint on which seems to have bonded well this time
 
IceUK said:
Can you not pva the wall, or certainly a test area let it dry then paint
Click to expand...
Can't paint onto PVA.
Although thinking about it, what is wrong in putting a latex based paint onto pva'd wall?

I've heard something about different types of paint don't react well to each other, need a pro painter to confirm though.
 
You must log in or register to reply here.
Back
Top Bottom