Painting after plastering??

avantra

We mistcoated everywhere with B&Q super cheap value discounted watery matt stuff and it worked very well, two coates over walls that had bonding done and one coat of the stuff on walls that only needed skimming.

You can't beat this for £9 for 10 litre.

keystone

claire-f wrote: »

We whitewashed all our newly plastered house and it all went fine.

No probs - whitewash isn't paint though. Your first coat will have performed a very similar function to a mistcoat of emulsion paint.

Cheers

keystone

avantra wrote: »

We mistcoated everywhere with B&Q super cheap value discounted watery matt stuff and it worked very well, two coates over walls that had bonding done and one coat of the stuff on walls that only needed skimming.

You can't beat this for £9 for 10 litre.

Yep - the sheds own brand stuff is fine for using a mist coat as long as it isn't vinyl and you don't need to thin it either as its as weak and watery as peas in the first place.

Cheers

avantra

keystone wrote: »

Yep - the sheds own brand stuff is fine for using a mist coat as long as it isn't vinyl and you don't need to thin it either as its as weak and watery as peas in the first place.

Cheers

Intresting, B&Q now sells 10 litre tins of 'paint for fresh plaster' under their own contract brand. Of course, it's the same paint as the value line but the marketing person decided they will charge £30 for a different name and one extra orange line on the label :mad:, so beware.

keystone

"Paint For New Plaster" is overpriced carp topped up with a liberal dose of marketing hype!

Cheers

27col

The Romans used to paint their frescos on to wet plaster. I painted my freshly skimmed ceiling a couple of days after it had been done. It's been up 5 years and shows no sign of any problem at all.

Mummy_Jo

keystone wrote: »

Thats extremely poor advice. If you've not done it already dont.

Cheers

Keystone - I've just come back to this thread and would really appreciate your comments. What was wrong with the advice by the plasterer? It is a few years now post plastering and everything seems ok... Having said that we never thought he gave it a good finish...

We were told it would act as a barrier and stop the moisture soaking into the plaster

Guessing though we should avoid PVA in the future?

Thanks

DVardysShadow

Mummy_Jo wrote: »

Keystone - I've just come back to this thread and would really appreciate your comments. What was wrong with the advice by the plasterer? It is a few years now post plastering and everything seems ok... Having said that we never thought he gave it a good finish...

We were told it would act as a barrier and stop the moisture soaking into the plaster

Guessing though we should avoid PVA in the future?

Thanks

PVA also stops the paint soaking into the plaster. I had some plastering done and the plasterer took it upon himself to PVA the wall with some leftover PVA he had. Never again!. The eggshell I put on started peeling in under a year.

keystone

Mummy_Jo wrote: »

We were told it would act as a barrier and stop the moisture soaking into the plaster.

Yes thats exactly the problem. PVA doesn't soak into the plaster it just sits on the surface as a very thin layer. When you wet it (like when applying your frst coat of emulsion paint) it goes "live" again and debonds from the surface - eventual result paint peels. A mist coat of paint sinks into the plaster and primes it so that the moisture is not sucked out of the following coats but the paint also bonds to the plaster.

Incidentally, thats also why you do not PVA before tiling because the only thing that is holding your tiles on the wall is a very thin layer of PVA!!!

Also have you ever tried steam stripping paper from a wall thats been "prepared" (ahem) with PVA?

Guessing though we should avoid PVA in the future?

Not entirely. It has its uses. The spread will prepare his brick/blockwork for plastering using PVA and in those circumstances yes it does prevent the water being sucked out of his plaster. It works fine for his purposes but the chemical/mechanical bonding process is different so its horses for courses.

HTH

Cheers

Mummy_Jo

I am hoping then that 5 years post plaster that we have been lucky as we haven't had any paint peeling?