This is because the tannins brought into the ceiling by the water bleed right through a coat of.
How to cover water stains on ceiling.
Your best option for a base coat to cover water stains on the ceiling is an oil based mold resistant stain blocking primer in a shade closely matching that of the existing ceiling.
Before you can get water stains off of your drywall ceiling first you will need to eliminate the source of the moisture otherwise the stains will just keep coming back.
Painting over the stain isn t difficult but it requires an undercoat of stain blocking primer to prevent the stain from reappearing.
Water stains have a way of coming back again and again even after the water has long since dried.
Start by finding the cause of the leak and repairing the problem to prevent damage in the future.
If you don t have time to restore and cover up the stain here are some alternative ways to remove it without using paint.
Ceiling water stains are almost always caused by a leak.
Once the problem is solved put on safety glasses and gloves and blot the stain with a mixture of one part water and one part bleach.
This means you can still get water stains on your ceiling even if you ve covered the whole surface.
Follow these steps when covering over a water stain on your ceiling.