Plastering onto paint

[DICEGEORGE]

I've got a brick and block wall in my kitchen, if i paint it now with masonary paint will it be easy to plaster over it in a few months or years?

Or would I be causing problems?

[george]

[spuorgelgoog]

No.

Yes.

Owain

[DICEGEORGE]

what problems? because brick is porous and paint not? couldnt i PVA over the paint?

[spuorgelgoog]

You might be okay scoring/scratching the painted surface to key the plaster to the brick, but it's probably a lot of extra unnecessary work.

Owain

[Steve]

I am not a plasterer, but I've seen underlying paint blister when plastered over. Sometimes the bubbles dry back, sometimes they don't...

[Tim Watts]

PVA is the usual way - check it's sound, if not, wire brush then PVA :)

[John Rumm]

Its the way plasters would "glue and set" a painted artexed ceiling for example. Knock of the highest spots mechanically, roller with PVA, and the plaster onto it while still tacky.

(note this is for a skim coat - might not work so well for a full base coat of plaster!)

[Mark]

Wot he said.

[stuart noble]

IME artex will stick where plaster may not want to (plus it's a lot easier to use)

[Mark]

But artex is the spawn of the devil ;-)

[stuart noble]

Only if you texture it

[Tim Streater]

If it's not textured, it's not artex is it?

[Rob Morley]

Artex is the coating material itself, a cross between paint and skim-coat (so it has fillers added to give it "build").

[stuart noble]

The Artex I've used as a plaster substitute is a powder, not unlike PB joint filler. Speed is the essence of plastering, and I'm extremely slow, so the longer open time is a bonus for me.

[Rob Morley]

That's the stuff.

I'm rubbish at plastering, but at a chimney-breast-sized area I've not had a problem with it going off too fast. Perhaps you're braver than me. :-)

[Tim Watts]

Me too - and for that sort of area, I find you can actually sit around for a coffee between coats.

Now a 4m x 2.4m wall is about the most I can handle single handed - I've just got one on when it's time to wash up, mix and apply the 2nd coat.