Ronseal Damp Seal Aerosol permanently blocks damp stains and prevents them from damaging topcoat paint. The aerosol application makes it easier to access hard to reach places. It can be applied directly to damp surfaces and only takes 10 minutes to dry. Usage areas: All interior walls and ceilings.Compatibility: Bare and previously painted walls and ceilings.Coats required: 2-3.Size: 400ml.