Ceiling paint keeps flaking / crumbling

Ceiling paint keeps flaking / crumbling

Ceiling paint keeps flaking / crumbling

There was a leak previously but it's now dry. I scraped away old paint but it kept flaking and crumbling to dust. I then coated it with gloss paint to try to seal it. It lasted a bit longer but it's still coming down. Would damp seal paint work better? I know for wall plaster affected by rising damp you'd need to remove the plaster due to salt but a bathroom leak that has dried should not continue to make the paint react? Ceiling is in hallway above flat entrance door so it's not a humidity...

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by ahlondon

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