Dulux Trade Stain Block is a 2-in-1, water-based primer and topcoat that has been designed to prevent the migration of stains through the finished paint film. It can also be used to seal and bind friable, dry and powdery surfaces including plaster, brick and distemper. The product should be used on interior walls and ceilings. It can be used to cover a range of stains including water-based and solvent-based inks, crayon, biro, coffee, grease, scuff marks, water and nicotine. Features: 2 in 1 primer and topcoat Improved opacity Improved whiteness Lower sheen Scrub class 1 rating 99.9% VOC free