Primer for interior walls

Please get a professional in and don’t use my builder or other related apps who take money from contractors and therefore up your price. If the wall was previously painted in silk please prime by sanding, cleaning and using a zinsser 123 sealer.

Your the first person I’ve known to have taken paint off walls therefore firstly I’d be concerned your walls might need plastered/lined for the best results I would buy a good brand of paint ,as these can be self priming/undercoating and give a better overall finish and no need to water paint down

It is hard to tell what to do without seeing it. But if the wall paint is stripped and bare plaster exposed, then definitely would use primer but PVA in 1:4-1:5 rate in prior. Before that I would sand and fill the wall to make it smooth if necessary. I hope my answer helped.

Firstly. Do not pva any surface that is to be painted. That is very bad advice. Now.....with the info you have given, i think the problem might be this: ( i come across it often enough) The paint that was on your walls was problematic and relatively easy to remove because when first painted they were not prepared correctly. Mist coating with the correct paint is often not carried out. The biggest drawback of not doing this is that the origional plaster, during drying and setting, has a fine film of dust on its surface. Consequently painting with the wrong paint and paint that has not been diluted causes a paint film that isn't adhered. Somewhere down the line with further coats of paint this lack of adhesion will cause bubbling and fine fissures in the coating. When removed the dust will still be there. So my advice to effect a lasting solution is to wipe the walls down with a wringed out sponge or microfibre cloth( rinsing) When dry. Apply a mist coat of paint for new plaster. Then paint with the emulsion of your choice but ease the paint for the first coat with water as the plaster will still be very absorbant after mist coating