If pieces of the ceiling and not just the.
Covering water stains on ceiling.
Dip a sponge in the mixture and standing on a stable stool or stepladder wipe the stain.
Use shellac based stain blocking primer or an equivalent high solids latex primer.
Spray cans work better than a brush especially on popcorn or textured ceilings.
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.
Use a clean sponge or rag and dip it into a mixture of water and bleach.
Follow these steps when covering over a water stain on your ceiling.
Apply the solution on the ceiling using light and controlled strokes.
Mix 1 part bleach with 3 parts warm water.
Start by finding the cause of the leak and repairing the problem to prevent damage in the future.
Use a sponge or rag that s damp with clean water to wipe the bleach mixture on the ceiling in a controlled manner.
Rinse with a second sponge dipped in clean water then dry the area with a tea towel.
For lighter woods like knotty pine you can use oxalic wood bleach to remove the dark stains caused by water.
Purchase a spray can of stain blocking primer or sealer.
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.
If your wooden ceiling has a lighter shade you can use a bleach to lighten the dark spots caused by the water stains.
Wear protective eye wear as the bleach is a fluid you will need to apply above your head.