Zinsser BIN Primer GREYZinsser BIN stands as the pinnacle in shellac based primers, sealers, and stain killers. Tailored for interior surfaces and spot priming exterior surfaces, its versatility knows no bounds. BIN boasts unmatched adhesion to glossy surfaces, including glass, eliminating the need for scuff sanding. It excels at blocking stubborn stains, from water stains to fungal degradation, nicotine, and more. With its high adhesion shellac formula, BIN seals porous