Painting after Plastering

miah · 11 Jan 2004

Hi All,

We had our bedroom plastered about 2 months ago, and now we have just started to paint the wall. The walls are fully dried and pinky.
The problem we are facing is, after we put on the fist under coat with a normal white paint, we than noticed dark patches on the wall everywhere.

So we thought OK, let’s put a another coat but this time with a thicker paint but still no joy.

Appreciate if someone can help us here.

Kind Regards

oilman · 11 Jan 2004

Since almost everybody has to use paint, we have been battered by adverts telling us one coat is all you need. I found that doing things the older ways gave better results. First a thin coat or two to key onto the surface then four or more coats until it looks ok.

I know, nobody puts on this number of coats. When you see the difference it makes, you'll see how to get a good finish.

Same things work with varnish, 4 coats and you wonder why you bothered, when you get to 8, you are glad you did.

Just don't believe 1 coat will work, unless you mix a filler in and put it on with a trowel.

As a serious alternative what about limewash?

nstreet · 11 Jan 2004

Its always a good idea to apply a couple of mist coats onto new plaster. This is the same emulsion that you will be using, only water it down first.

Scoby_Beasley · 11 Jan 2004

oilman said:
Same things work with varnish, 4 coats and you wonder why you bothered, when you get to 8, you are glad you did.

Agree totally, 3 coats diluted varnish to key in, 4 or 5 neat varnish, fine wire wooling between each one (bloody dust), T-cut final coat, cupboard I renovated 15yrs ago still looks like it has a piece of glass on top of it (or am I thinking of me local bar ??)

GwaiLo · 11 Jan 2004

The first coat on new plaster should be an alkali resisting primer. Every paint manufacturer makes one, and every paint manufacturers recommends it is used on all new plaster. However such primers are not cheap compared to a mist coat of emulsion so often it is not used.

However, I appreacite that is a bit too late to help you now.

miah · 11 Jan 2004

Thank You all for you advise.

miah · 12 Jan 2004

Just wanted to let everyone know that, someone suggested to me to try putting on PVA and then put 2 coat. It worked amazingly result 98%, we may have to put another final coat to achieve 100%.

Miah

antinator · 12 Jan 2004

welll i was going to say why not just knock the plaster off the wall move to a house which is already painted and then theres your problem solved

miah · 12 Jan 2004

antinator said:
welll i was going to say why not just knock the plaster off the wall move to a house which is already painted and then theres your problem solved

I don’t understand what are talking about!

antinator · 12 Jan 2004

move to a house where a decorator used to live then you'lll have your house fully decorated

amtodd · 12 Jan 2004

I generally find the cause of such "dark patches" to be PVA droplets / splashes. Sanding them off is our solution.

move to a house where a decorator used to live then you'lll have your house fully decorated

Are decorator's partners good at DIY then? Few of the tradesmen I know do a right lot of 'work' at home, although they all seem to do evening and weekend work for friends.

antinator · 12 Jan 2004

welll if you scrape away the pva on the wall the cover it with a skim of plaster again but mix the plaster with the pva mix not just water

oilman · 12 Jan 2004

PVA, yes I know it works, but it's a cr*p method in my view. There's no end of problems with condensation because water vapour can't escape, and putting a sealer like PVA on does nothing to help. Vinyl emulsion and wallpaper are poor too.

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Painting after Plastering

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