New plaster mist coat - what paint?

[Helliecopter]

Almost time to paint the new longest build in history ever extension. I know we need to apply a first coat of watered down paint to the plaster because I've been reading about it obsessively online for days but I'm not sure which one to go for. Umpteen threads online say B&Q value white paint watered down 50:50. Some say Dulux trade super matt watered down 90:10. It's a pretty big space so if the cheapo options will work I'm all for it, but don't want to bugger up my nice new plaster...
Any experience of either, or a different method?
Cheers
PS: I know to avoid PVA like the plague and to instantly ignore anyone who suggests anything like that :fwink:

I've never had a problem with the B&Q stuff, for mist coats and undercoat etc.

I used the Dulux stuff - worked well.

yeah, cheapo paint 50:50

Is that what its called then, DP calls it a miss coat - hes a builder I just asked him, and he says actually needs to be less tan 50:50 - i think "really pissy" was the terminology he used!

yep cheap white paint 50:50, doesn't need to be anything fancy.

Oh I dunno! Miss coat/mist coat...not sure. Have seen both written. I shall just tell OH to make it "really pissy"
He's just been to B&Q and got the value white matt emulsion and think it's going 70:30.

Dulux Trade Supermatt

What you want is something that is non-vinyl, so the new plaster can continue to dry out without blistering, and matt, so that future coats adhere well. Wait until any chocolate brown or shiny patches of plaster have dried out and it is pale pink all over, then sponge off any dust. Fresh air and fans will dry it out faster than turning up the heat.

Use White for the first couple of thinned coats. It will give you an even colour and absorbency, and will highlight to the eye any remaining blemishes that you can correct befeore moving on to your more expensive finish coats after the plaster has finished drying. White is also cheaper and pretty well certain to colour match. Never never never put glue on any surface that you hope one day to paint.

If you can't stand white for even a few weeks, apply a pale colour supermatt over the top. Having a pale and even colour and absorbency means you need less of your finish paint to get a good effect. It is easier to patch-prime repairs with white and make them match than if you are working with a colour.