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Bubbling and peeling original paint

Posted: Sun Jan 03, 2021 3:25 pm
by Hammertel78
I started to paint and the original paint started to bubble up. If I run a damp sponge across the wall the paint bubbles, lifts and peels away like skin.
I’ve peeled it all off of all walls but why would it do this and can I now paint straight on to the wall?