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Best wall sealer for bare walls?
So back in 2013 I had my new house painted. The guy who painted was a "professional" (hardly) and he said he had sealed the walls which he obviously didnt as you can see by the photos, 90% of my walls i can just peel huge chunks of paint off.
So ive been scrapping and peeling back to the bare walls (I live in Perth so the walls are brick with plaster set over top)and then applying a skim coat on the places my scrapper has taken bits of plaster away.
So once the bits of skim coat plaster has been sanded back smooth, whats a good sealer primer to use?
I really wanted to use oil based but i have indoor animals that ive read it can be harmful for them to breath in, plus oil based takes longer to dry and dont want my animals hair getting stuck on the walls while it dries. So i guess water based is what i need to use, but which one? Any info would be appreciated
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Re: best wall sealer for bare walls
Hi
This solution may raise some eye brows but it is perfectly sound in application.
Wet down your very porous plaster with a mixture 1 Part PVA Glue with 3 parts water and let it dry Use brush and or roller.
Wont cost you the earth in expensive under coats.
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Re: best wall sealer for bare walls
Hello @jordcam1983
I propose using Dulux 1Step Prep Primer, Sealer & Undercoat 4L. My best advice is to make sure that all the dust on the surface of your walls have been wiped away before you coat it with the primer.
If you need further assistance, please let us know.
Eric
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Re: best wall sealer for bare walls
Thank you. Ill be wiping it down for sure. Ill use my vacuum with a brush attachment and wipe down the excess
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Re: best wall sealer for bare walls
Hi @jordcam1983
I have used a very similar mixture before binding a dusty cement and brick wall ready for rendering. My actual water mixture was bond crete which is very similar to PVA and it really works well sealing waterproofing and providing a good under base for additional top coatings to stick too.
Sounds like your plaster could use a little binding and the pvc coating allows paint to bind to it more easily but lets prove it to our selfves before you do your whole house you dont need another coating failure I have being there too.
I highly suggest we do a test of the mixture I am sure you might have Aquadere in your shed or some can be bought in small bottle, mix some with water and try in on a test area inside a cupboard then paint it.
I was just doing some economics and Shelleys Aquadhere PVA is $21.95 for 500ml Mixing this into the water ratio will give us 2 litres only.
So there is no gaining economically using this PVA solution and @EricL paint choice is the better paint choice with out the oil paint smell or science project to test it
I want you to use a sure thing you dont need this task again any time soon.
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Re: best wall sealer for bare walls
The walls under the paint are quite dusty from removing the high quality paint🤣
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Re: best wall sealer for bare walls
Hi @jordcam1983
I am hearing you re dust. I also am thinking what you're not saying will the next paint layer come off too.
Ideally we need to bind that surface and dust.
This
Another Method for pure new real plaster walls not just powdery gyprock is to mix up a paint emulsion a mist coat. Simply put is your paint /under coat watered down 10 parts water one part paint
Brushed or rolled on to a bone dry wall. The mixture should soak into the wall and help seal the wall let it dry to bone dry as well.
Last Resort
Maybe your pets can go on a holiday for a couple of days as the strongest commercial sealer binders seam to be oil based.
Dulux PRECISION® Sealer Binder is an oil-based prepcoat that seals porous surfaces and binds unpainted powdery surfaces such as bare plaster, cement sheet and brick to provide a sound foundation to apply subsequent paint coats.
- Suitable for use under Dulux topcoats
- Oil-based
- Interior and exterior use
- Available in 1L, 4L, 10L
- Available in White base
- Seals porous surfaces and binds unpainted powdery surfaces such as bare plaster
It says chalky paints it bonds too further down on the can
Dulux 4L PRECISION White Maximum Strength Adhesion Primer I/N: 1400849 $111.50
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Re: best wall sealer for bare walls
So i have a 10L tin on dulux 1 step primer sealer water based in my garage, so u say mix 10 parts water to 1 part of this and roll/ brush it on first? Then a coat of undiluted dulux 1 step, then paint colour on top?
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Re: best wall sealer for bare walls
Hi @jordcam1983
Yes exactly that but make sure the plaster is bone dry before all coats.
By plaster I am talking about a real plaster wall as chalky as they come.
After the 10 parts coating feel it with your hand see if the process helped.
This tip comes for my Croatian painter neighbour and he is a good painter.
Never need to exactly do this to a wall yet so haven't tried first hand just so you can weight up the quality of the information.
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