Purchase a spray can of stain blocking primer or sealer.
Covering water stains on ceiling.
Follow these steps when covering over a water stain on your ceiling.
Test the ceiling for water damage prior to painting by cutting an x in the center of a stain with a utility knife and applying a piece of duct tape.
Rinse with a second sponge dipped in clean water then dry the area with a tea towel.
Use shellac based stain blocking primer or an equivalent high solids latex primer.
If you have a coloured ceiling use oxygen bleach rather than chlorine bleach.
If pieces of the ceiling and not just the.
Start by finding the cause of the leak and repairing the problem to prevent damage in the future.
For lighter woods like knotty pine you can use oxalic wood bleach to remove the dark stains caused by water.
Use a clean sponge or rag and dip it into a mixture of water and bleach.
Wear protective eye wear as the bleach is a fluid you will need to apply above your head.
Mix 1 part bleach with 3 parts warm water.
Spray cans work better than a brush especially on popcorn or textured ceilings.
Use a sponge or rag that s damp with clean water to wipe the bleach mixture on the ceiling in a controlled manner.
Cover the floor with plastic and find a good pair of goggles drips are a fact of life when painting the ceiling.
Dip a sponge in the mixture and standing on a stable stool or stepladder wipe the stain.
Apply the solution on the ceiling using light and controlled strokes.