Dulux PRECISION Stain & Mould Blocker is a water-based, powerful stain blocker designed to help combat a wide range of oil-based stains. It has been specially formulated to inhibit mould and mildew growth. Use it on walls and ceilings inside your home and outdoor areas, on multiple surfaces including plasterboard, timber, MDF, chipboard, plywood, aged enamel, render, brick, masonry, concrete and cement sheet. Touch dry in 20 minutes and ready to recoat in two hours, it helps you gets the job done quickly and efficiently. PRECISION Stain & Mould Blocker is recommended for use under Dulux topcoats.