Painting on freshly plastered walls

[MonkeyBusiness]

Bit of advice please.
I have a mammoth day lined up tomorrow painting newly plastered walls.

I have been told that new plaster tends to soak up paint. Is there anything I can ''slap' on first to prevent this?
Runny wallpaper paste has been mentioned.

Thanks.

[roofer]

Use a microporous paint.

[MonkeyBusiness]

roofer said:

Use a microporous paint.

Thank you. The paint is Dulux and already mixed. You wouldn't happen to know if this is microporous?

[Wings]

You need one or two coats of a very weak solution of matt emulsion.

[IainZ]

Wings said:

You need one or two coats of a very weak solution of matt emulsion.

This - just use white paint & mix it down till its very watery.

...or get some Dulux plaster sealer (but that takes a few hours to dry before you can paint over it).

[Fort Jefferson]

Wings said:

You need one or two coats of a very weak solution of matt emulsion.

Mix about 25% to 30% water with the first coat.

[Alfachick]

You need to seal the plaster with something. I used PVA glue watered down about a 50:50 mix. This worked really well. I also put a base coat of white emulsion down before putting colour on the walls.
I left my walls to dry for a good couple of weeks before painting though.

[J.R.B.]

Sealing plaster with PVA is about the worst thing you can do. As stated, a slightly watered down emulsion is all you need and then a couple of neat coats over the top of that. The plaster should be left to properly dry before painting though. For a skim a minimum of 2 weeks is what I'd recommend. For a full plaster job I'd personally leave it for 4 to 6 weeks to dry before painting. If it is really fresh plaster then use a microporous paint as previosuly mentioned. Something like Leyland Super Leytex or a contract matt.

[dingg]

Alfachick said:

You need to seal the plaster with something. I used PVA glue watered down about a 50:50 mix. This worked really well. I also put a base coat of white emulsion down before putting colour on the walls.
I left my walls to dry for a good couple of weeks before painting though.

PVA glue mixed with water then straight on with the emulsion works for me ,but the pva is a must to save time and having to waste lots of paint

[MonkeyBusiness]

Thanks for the tips everyone. I'd have quite happily put the colour on and wondered why it didn't quite look like the label on the tin.

Edited by MonkeyBusiness on Saturday 5th November 15:24

[jas xjr]

Google " mist coat ."

[Alfachick]

J.R.B. said:

Sealing plaster with PVA is about the worst thing you can do. As stated, a slightly watered down emulsion is all you need and then a couple of neat coats over the top of that. The plaster should be left to properly dry before painting though. For a skim a minimum of 2 weeks is what I'd recommend. For a full plaster job I'd personally leave it for 4 to 6 weeks to dry before painting. If it is really fresh plaster then use a microporous paint as previosuly mentioned. Something like Leyland Super Leytex or a contract matt.

I was just following the advice of my plasterer. He seemed to know what he was doing and had done an amazingly good job in my living room.
Walls have been painted now for about 3 months and look fine, no cracks or anything.

[J.R.B.]

It's a common player's/builder's myth. Read the 'limitations' section of the attached instructions from the Unibond PVA instructions...

http://www.specifinder.com/brochures/3013_pdf6.pdf

As plaster dries a load of salt and minerals rise to the surface. If it's sealed before this is complete then it can push any coating that's been applied off.

Edited by J.R.B. on Sunday 6th November 03:16