This Ronseal Damp Seal Aerosol is ideal if you have a damp patch in an awkward to reach place, This Damp Seal Aerosol takes just 10 minutes to dry and permanently blocks damp stains. There is no need for paint brushes, so the clean-up is easy. It needs 2-3 coats to permanently block damp stains and stopping them from ruining the topcoat. Dry Time 24 Hours Coat Time 10 Minutes Colour White Finish Matt Size 400ml