Ask a tradesman

Painting & Decorating

How do i improve an uneven paint finish on newly plastered walls

We recently had a bedroom replastered, the plaster was left to dry for over a week and then as advised by the plasterer a 50/50 PVA and water was painted on to stop the Paint being absorbed by the plaster. 3 coats of matt emulsion later with some sanding inbetween there is still a very patchy finish, the paint apears thick in some places and won't cover in others. How can this be remedied as we want to leave the walls just painted?

6 Answers from MyBuilder Painters & Decorators

Best Answer

Can't understand why you've been told to use 50/50 pva.
I've been in the decorating game for over 18 years and have never slapped pva on as a sealer, if I would of done that on a new built house I would of been kick off site!!
Really you should of watered down a non vinyl based emulsion paint around 60 part paint to 40 part water (mist coat) then follow by 2 full coats.
Re rub your walls and use a neat coat of vinyl matt emul - use a good quality roller and roll straight up then back down in one go, don't go in all directions and make sure you have loaded the roller evenly with paint.

Well Proctor I'm a pro dec and so is my business partner (over 40 years experience) and neither of us would use pva - Ever! I've worked alongside countless decorators and have never seen one "misting" with Pva.. Bright's comment is spot on as with EVERYONE else...


Answered 3rd May 2012

PVA is the best you can do to seal any type of wall i have used it for years. Your problem is simple you are useing the paint too thickly and not spreading it out evenly . Thin your emusion down to make it more easy to work with. A lot of people who leave a anser on these sites are not professional decorators.


Answered 29th Apr 2012

Hi dear,
well i am a proffessional deccorator and any pro will tell you that PVA is not a very good product to seal your walls with as its basically glue, and glue turns to rubber and paint does not adhere to rubber unless its made which would make it a specialist paint but being as emulsion is not then the lads are quite right in their answers.
Usually a miscoat does the trick and leaves your walls in sound condition for any future works, where as PVA does not as you have to re-work the walls to remove it which is alot of re-working if you wish done properly, your problem is you have uneven amounts of PVA build up and because it has dried its thick in spots which gives the impression your paintwork is uneven. Be assured it more than likely is not.
When sanding are you getting that residue as if your using a rubber to rub out pencil on paper ?
YOU need to get an electric sander and abrade your walls completly back to plaster then go to your local decorator centre and by a tin of Zinsser Bullseye 123 in the blue tin or Zinsser Gardz in the gold tin, this product will seal and prepare your walls for emulsioning and you will not need a miscoat or a out of date PVA treatment, some decorators have realised we are now in the 21 centuary and todays products no longer work with yesterdays formulas.
All the best my dear


Answered 3rd May 2012

never heard of this 50/50 pva idea,50/50 mist coat emulsion yes,the problem sounds like the pva has done its job in places and sealed the area which means the paint is not drying out equally,you shouldnt have to sand newly plastered walls ,or newly painted walls,cant really advise without seeing but dont think you should have used the pva in the first place


Answered 28th Apr 2012

Hi Betty,
If you have used a high quality trade paint (dulux) then 3 coats of emulsion should of been enough to cover the plaster, many people make the mistake of buying a cheap paint only to find they have to put on more coats to cover, lightly sand, buy trade emulsion, good quality roller, apply a further 2 coats and there should be no further problems..
Alan.. Francis decs.


Answered 28th Apr 2012

Hi Betty, I have never used PVA to seal fresh skim before, and everyone I
know would water the first coat of emulsion down to allow it to absorb, the
painting problem that you have normally happen's when the plasterer has over
trowelled the wall in some place's, this can cause the patchy effect just like
you describe.
The only thing I can suggest to you is to sand the area's that are not taking
the paint, see if you can get through that layer of PVA and don't re apply PVA
because this may not be helping.
Hope this is of help to you.
Kind regard's
Paul Callaghan


Answered 28th Apr 2012

Post your job to find high quality tradesmen and get free quotes

Can’t find an answer? Ask a new question

Question Categories