Peeling Paint Solution Needed

[an3_bolt]

Hello again,

Once again after some advice:

New door frames etc for some older walls that a previous owner has cement rendered and white set. The walls appeared to be in fairly good condition when we moved in several years ago. In due course of making a house "ours" it had a good clean and some dulux 101 over it all.

However - at points where I have removed skirting and redone door frames, the paint has peeled off with the old material, leaving a lifted edge. With a rasor blade I can lift the edge and peel off sheets ranging from a 20c coin size through to $5 note. The bare plaster underneath appears that it most probably did not have an oil based sealer primer applied - rather an acrylic sealer that lifts with the paint.

There are no bubbles (delamination) on the walls and it passes the masking tape pull off test.

The walls need to be repainted obviously. The bare areas will get some Masterprep pigmented sealer then some 101 over the top.

However - how to resolve the peeling edge problem of the old paint? Cut edge with a rasor blade - peel up to the cut and simply over lap the sealer? Welcome any other good solutions........not too keen on peeling off a complete wall.......but also not too keen on having to peel off a wall after it gets painted again......

Pictures below for your viewing pleasure -

Any assistance gratefully received.

Cheers

895598956089561

[Impression]

Only thing you can realy do now is scrape of as much of the loose stuff as you can and apply 1 coat of sealer binder before painting. The sealer should soak into the surface enough to bind everything together.

[tychocaine]

Sorry to revive on old thread but I have the exact same issue as the OP... the paint looks fine, but any time I try to patch and flush any obvious cracks whole sheets peel away... my biggest is about the size of an A4.
From my readings on the forum I assume it's because the plaster was not appropriately sealed prior to painting at any time in it's past, or it was undercoated with a water based sealer that didn't adhere to the plaster properly... would this be correct?

I need to do some chasing and a whole lot of patching anyway, so my plan was to strip the paint back to the original plaster, then seal with an oil based undercoat/primer/sealer/whatever is appropriate and paint over that with my preferred top coats. Would this be the best way to deal with it and end up with a clean finish that won't peel in future?

There are about 4 layers of existing paint and I'm worried if I just sand the cracks and seal over those areas I'll still have an underlying risk of large bits peeling off in the future.

Thanks in advance,

TC