Stain Block Damp Seal permanently covers damp, water and other household stains. It can be applied directly onto damp walls and ceilings. It’s important to make sure the cause of damp has been sorted before painting, otherwise it’ll just come back.
Open doors & windows to make sure the room is well ventilated. Remove any wallpaper and get rid of flaking paint with a damp cloth. Fill any cracks or holes, if needed. You can apply this onto damp surfaces, just make sure they’re not dripping wet.