"F" wrote in message
...
I've just repainted a bedroom ceiling that had been stained by a leak some
years ago. The repaint seemed, initially, to have been successful but now
it's dried the stain has reappeared.

Any suggestions on how to stop it reappearing after another repaint?

Dilute PVA?

Gloss undercoat, then repaint. Used that a number of times and works fine.
Tip provided by our local painter.

Cheers.