Rinse with a second sponge dipped in clean water then dry the area with a tea towel.
Covering water stains on 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.
Use a clean sponge or rag and dip it into a mixture of water and bleach.
Purchase a spray can of stain blocking primer or sealer.
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.
If you have a coloured ceiling use oxygen bleach rather than chlorine bleach.
For lighter woods like knotty pine you can use oxalic wood bleach to remove the dark stains caused by water.
Cover the floor with plastic and find a good pair of goggles drips are a fact of life when painting the ceiling.
Use shellac based stain blocking primer or an equivalent high solids latex primer.
You need to cover the stains with primer before painting and drywall primer won t do.
Follow these steps when covering over a water stain on your ceiling.
Wear protective eye wear as the bleach is a fluid you will need to apply above your head.
Spray cans work better than a brush especially on popcorn or textured ceilings.
If your wooden ceiling has a lighter shade you can use a bleach to lighten the dark spots caused by the water stains.
Mix 1 part bleach with 3 parts warm water.
Apply the solution on the ceiling using light and controlled strokes.
Use a sponge or rag that s damp with clean water to wipe the bleach mixture on the ceiling in a controlled manner.