Water-damaged ceilings can be a real eyesore. They usually are found whenever there is a leak in the roof or if a room is directly under a bathroom with some sort of plumbing issue.
Once you find the source of the leak and make sure it is fixed, the next step is to fix the water-damaged area.
If you have water damage that is not near a tape joint and it is only a brownish stain in the ceiling or wall, you can easily get rid of the stain by using an oil-based primer.
Watch the video on “How To Get Rid Of Water Stains” here.
However, if there is damage to taped joints, then you will have to remove the damaged tape and replace it.
I prefer using mesh Tape with Easy Sand mix joint compound aka hot mud.