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Preparing plaster for paint
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# 1
sue_balu
Old 30-09-2006, 4:13 PM
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Default Preparing plaster for paint

Hi Can anyone advise me please. I have a New plasterboarded area which has been professionally plastered (smooth bare pinkish finish) I wish to paint with emulsion paint. How long should I leave the plaster to dry and then do I need to "prime" it or prepare it i any other way before painting it? If so what with and how would you recommend?

Many Thanks
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# 2
Troubleatmill
Old 30-09-2006, 4:23 PM
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Default Wait until it dries!!

Once it has fully dried out - depends on ambient temperature - could be 1 day - could be 3 days...

Once dry..
Pop down to B&Q - but a massive tub of cheap magnolia paint.
Dilute it about 50/50 with water.

Paint your walls with a couple of coats - this will prime them nicely.


Otherwise all that nice new paint you have - will just be sponged up by the plaster.

Best
Troubleatmill
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# 3
emilyt
Old 30-09-2006, 4:26 PM
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Default

Quote:
Originally Posted by sue_balu
Hi Can anyone advise me please. I have a New plasterboarded area which has been professionally plastered (smooth bare pinkish finish) I wish to paint with emulsion paint. How long should I leave the plaster to dry and then do I need to "prime" it or prepare it i any other way before painting it? If so what with and how would you recommend?

Many Thanks
Hi there sue-balu,
Just done the same job ourselves.
We waited for the plaster to go a very pale pink. This is when you know it is dry.Took about 4 days for us.
We then painted on some Universal primer sealer clear bought from B&Q. This is usually ready to be painted over after 3 hours. We left it 24 hours just in case.
Next we had to emulsion the walls and cealing about 6 times before it looked right.
We have made the mistake in the past of painting emulsion straight onto a newly plastered walls and the paint ended up peeling. We learnt from our mistake.
Hope this is of some help to you.
Emilyt
When life gives you a hundred reasons to cry, show life that you have a thousand reasons to smile
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# 4
misgrace
Old 30-09-2006, 5:04 PM
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To get a good finish on new skimmed plaster you need to apply a miscoat, similar to what troubleatmill said, but if you go for the B&Q stuff as a cheap undercoat, be very careful if you then buy a good quality paint say for example 'dulux' as a top coat.

if your going to use B&Q paint, then stick with it all the way, dont mix the two.

Do a watered down first coat, (miscoat), this seals the plaster, (please do not use PVA there is no need), then your second coat water down again, but not as much, and then the third coat just maybe a tad bit of water, this is if your using 'Dulux', or 'crown' but if your using inferior paint, it might not need a lot of water for the second and further coats.

Go for Matt, you can get away with using Vinyl matt for a skim plaster, but dont use silk or soft sheen.
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# 5
sue_balu
Old 30-09-2006, 6:09 PM
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Default

Many Many thanks to you for all the advice - The 50/50 mix emulsion water miscoat sounds sensible. Only thing is, I've got my heart set on Farrow & Ball emulsion in "light grey" for the final finish.
What brand of white emulsion should I use for the miscoat do you think? I dont want to risk any mismatch/conflict and end up with the F&B peeling off!!
I know F&B is not cheap but we dont decorate very often and we've found it covers very well when we used it before - seldom needing a second coat.
Hence less work - all for that!!
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# 6
handyman.
Old 30-09-2006, 6:12 PM
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Quote:
Originally Posted by Al Mac
Mix PVA glue with water, about 10% PVA, does the job. Not sure if it is cheaper
100% wrong, you have just made that up, have you not?? Please give us a link to a paint suppliers site that states this is the correct way to seal plaster.

Unbelievable
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# 7
Sooler
Old 30-09-2006, 10:31 PM
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Dulux Plaster Sealer is ideal for priming bare plaster surfaces, plasterboard and powdery surfaces inside. It penetrates the surface, sealing it ready for painting. Where staining is a problem, a specialist primer should be used.

http://www.dulux.co.uk/webapp/wcs/st...Id=-1&code=DPS
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# 8
abbecer
Old 30-09-2006, 11:32 PM
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Handyman, I've not used PVA myself but i have heard of many people who do. We usually just use up watered down odds and sods of pale emulsion.

Rebecca x
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# 9
save-a-lot
Old 30-09-2006, 11:48 PM
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Default

Quote:
Originally Posted by Al Mac
Mix PVA glue with water, about 10% PVA, does the job. Not sure if it is cheaper
When preparing a wall for a skim of plaster you use watered down PVA glue to aide the adhesion of the plastered skim to the underlying wall surface.

If you get PVA glue on the top of a surface you want to emulsion then the places where the PVA has been applied is waterproof and the emulsion will run-off those areas. Don't use PVA
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# 10
handyman.
Old 01-10-2006, 7:49 AM
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asi say every time posts about pva and painting.........find a link in a paint manufactures website that says to pva a wall before painting.....and knowone ever does
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# 11
handyman.
Old 01-10-2006, 12:33 PM
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mist coat of non vinyl matt emulsion watered down 30%. Then paint as normal. Would go for dulux trade supermatt, which can also be painted on wet 1 day old plaster
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# 12
misgrace
Old 01-10-2006, 5:53 PM
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Quote:
Originally Posted by Al Mac
Thanks for the vote of confidence Only done it on a couple of walls, not had any problems with them:confused: Think it was a builder friend that told me to do it Anyway best ignore my post, as apparently it's wrong

Almac, you have been very lucky not to have any problems, but the PVAing of walls does cause a hell of a lot of problems, and you only find out the problems after you have painted the walls.

a lot of people are under the misconceiption that you PVA walls prior to painting, but there is no need, if you apply a miscoat,and a few posters on here have done it also, then you wont have any problems I promise you, as long as its not silk.

Sue Balu, I have used F&B on many occasions, and it is a smooth flowing paint, and it has a good coverage, you can either buy extra of the 'grey, and apply a miscoat,ok it might cost you a bit more, but at least you will have a good quality paint on your walls,and some spare for touching up at a later date or, go over the walls with 'Dulux supermatt', again a miscoat (watery down coat),then finish with your F&B, but please try and avoid using 'wicks, or homebase paint if you can.

If your F&B is Vinyl matt, then it wont do any harm going over 'dulux' supermatt, but I wouldnt put supermatt over vinyl paint, same as you dont paint matt over newish silk paint.

I have done this, and you will be okay, as long as you thin down the first coat, and let is dry thoroughly before apply further coats.
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# 13
nickj
Old 01-10-2006, 7:02 PM
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i have just done a job for a person who told me after i'd finished that when she painted the walls , she stripped all the paint off , treated walls with pva and then emulsioned them , 4 months after i'd finished the job in a couple of places the paint had cracked , i got a scapper and it was like peeling wet wallpaper , the new emulsion had lifted the old paint away from the wall , it had no adhesion to the pva or plaster at all . when i explained it was probably due to pva she totally denied saying it and blamed it on me. i think on unibond tins it does say " not suitable for painting with water based paint "
so in short DO NOT PVA YOUR WALLS !!!
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# 14
helen81
Old 03-10-2006, 2:45 PM
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[QUOTE=misgrace

but please try and avoid using 'wicks, or homebase paint if you can.


Hi,

Whats wrong with Homebase paint?? You've got me worried now..Ive bought some for my living room!

Helen x
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# 15
misgrace
Old 03-10-2006, 4:36 PM
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Sorry to have got you worried helen, its just I have always used 'Dulux', but sometimes a client will buy thier own paint, and if its B&Q or Homebase, then I have to do more coats as its thinner.

Wicks is the worst paint of all, it is like water, I nearly had a nervouse breakdown cause client had bought it, and it just wouldnt cover, I had to do quite a few coats.

I'm sure homebase is okay, its just me, I like the good stuff

There is so many offers out at the moment for Dulux, and its so thick, that you get a lot more from the tin, I even find crown a bit thin, if you get chance, try Dulux, and you will see what I mean.
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# 16
helen81
Old 03-10-2006, 6:42 PM
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Phew!

Ok, I'll get refund on other and see if can stretch a few more qwid for delux.

Thanks for reply
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# 17
handyman.
Old 03-10-2006, 9:35 PM
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dulux trade all the way for me. Its the mutts nuts.

100% agree with misgrace, so if a customer supply's the paint, it must be dulux trade............I have learnt the painful lesson
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# 18
suitusir
Old 04-10-2006, 9:48 PM
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Hi,

All I do is wash down with sugar soap, gets rid of all the plaster debris, always have a good finish.

B+Q do it but prefer wilkonsons own brand a lot betetr.

Hope that helps,

Keep smiling,


Kevin
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# 19
handyman.
Old 05-10-2006, 3:47 PM
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sugersoap removed grease and general dirt.......no need to use it on new plaster.

Better to use one of these, with some 80 grade sandpaper on it, over al the walls before starting painting
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# 20
misgrace
Old 05-10-2006, 6:27 PM
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I had one of them HM, I couldnt get on with it, I couldnt do the ceilings as it was going all over the place, plus I didnt have the strength for the pushing side of it.

I do it the hard way, get up on the steps with a the rough green sandpaper, and away I go, I suppose cause I am used to it now that I dont mind doing this way.
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