How to stop water marks coming through paint
- Address the underlying causes of any water marks to make sure the problem isn't still happening.
- Make sure the wall or ceiling is dry and clean, and replaster if needed.
- Create a barrier by using a stain-blocking primer or oil-based paint first.
What paint to use to cover water stains? To create a barrier that stops the water stain from showing through, you'll need to use either a stain-blocking primer or an oil-based paint first. After that, you can apply an emulsion paint if necessary.