best wall sealer for bare walls

[jordcam1983]

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 

[Jewelleryrescue]

Hi

@jordcam1983 

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.

[EricL]

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