Zinsser's B-I-N is the ultimate shellac-based primer, sealer and stain killer. It is perfect for use on interior surfaces and spot priming of exterior surfaces.B-I-N offers unparalleled adhesion to glossy surfaces including glass without the need for scuff sanding, and it blocks stubborn and persistent stains. The high adhesion shellac formula seals porous surfaces with excellent enamel holdout, even sealing bleeding knots and sap streaks. B-I-N works brilliantly on water stains, mildew stains, nicotine, oil stains, marker pens stains and more. B-I-N permanently blocks every kind of odour (from smoke and fire damage to odours from pets and nicotine). Its dried film is non-toxic and hypo-allergenic, and it may be used in areas where incidental contact with food items occur.It can be applied via an airless sprayer, brush, conventional sprayer or roller. Perfect for interior ceilings, walls, doors and related paintable surfaces and spot priming on exterior metal, trims, PVC and wood.