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After it has dried out probably some Zinnser 123 would be able to seal it and also act as a primer before repainting? This worked for me when I accidentally knocked over my full dehumidifier in the loft and it stained the ceiling below.
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The plaster being damp might have caused the existing paint to come unstuck. You may find it coming off on in small sheets on your roller as you paint. You might want to do a certain amount of poking around with a scraper once it's dried out to check if any flakes off easily.
Hovis
ffm
@Spxtz
We've had a leaky ceiling due to some problems with our roof which are now fixed. The plaster on the ceiling hasn't sagged but there was a wet patch that's made a big brown tide mark. There was also some black mould in the middle of the wet patch, which I've treated with Ronseal mould killer.
What are my next steps to getting the ceiling looking normal? I'm planning to leave it for a few weeks to let it dry out fully and go over the whole thing again with mould killer at least once. But then I'd like to make sure that the tide mark doesn't come back through any paint I go over it with. Should I be using a damp barrier undercoat or are the one-coat options actually any good?