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Is what I've used to do this for 15 years. 2 coats rolled on usually covers any damp damage I've come across. It needs white spirit clean up for brushes or roller though which is a pain. If you use cheap rollers they might shed but you can bin them, really depends how you feel about throwing out rollers. You can brush it on but maybe go with 3 coats to be sure. It's touch dry quickly but follow the overcoating guidelines on the tin.
It comes in smaller sizes for a bit less money.
We had some damp due to a roof problem. We got that fixed a year ago and have left it as is to dry out. No new damp has appeared so we want to paint over and make it look better. I’m assuming that we should use a damp seal paint, is that right? Thanks!