We had the same problem and bought a specialist cover up water marks spray can of paint from b q can t remember the name.
Paint to cover water stains on ceiling b q.
Zinsser cover stain white ceiling wall matt primer 0 4l b q for all your home and garden supplies and advice on all the latest diy trends.
I ll probably have to go back and paint the ceiling so it all blends but this is 90 close.
I was pretty dubious tbh but a quick spray of the paint across the general area was all it needed it just disappeared.
Cover everything though seems to be a fairly heavy paint particle that comes out and i found a light coating on stuff that was 10 or more away.
Once ceiling is dry lightly sand down affected area with 180 grade sandpaper removing any loose paint apply fine filler to any cracks in the plaster and lightly sand smooth apply an oil based stain block b q sell a ronseal which works and is value for money allow to dry apply 2 coats emulsion to whole ceiling.
Don t be shy with the tin it doesn t cover massive areas but it does cover up the dark patches perfectly.
If you have a smooth ceiling roll the primer over the water stains using a paint roller with an extension and a inch nap roller cover then let the primer dry for two hours or as instructed.
No brushes to wash either.
Rated 5 out of 5 by guido79 from job done i only had one small water stain.
Suitable for use on plaster concrete stone masonry plasterboard and wood.
You need to cover the stains with primer before painting and drywall primer won t do.
Cover the floor with plastic and find a good pair of goggles drips are a fact of life when painting the ceiling.
It provides one coat coverage over water stains grease nicotine crayons rust and soot.
Use shellac based stain blocking primer or an equivalent high solids latex primer.
Polycell stain stop is a highly pigmented paint which permanently prevents stains reappearing through paint.
If your ceiling has a texture you ll find using an aerosol.
This product worked extremely well to cover a water stain on drywall.
How to stop water stains from bleeding through paint or how to hide water stains on the ceiling or walls.
Water stains are more common to be found on ceiling.