Zinsser B-I-N White Tintable Primer Stain Blocker, 1 Quart is a flat, white primer designed for every interior surface, including metal and glass. It effectively closes the pores of most surfaces, preventing bleeding stains and sappy wood from ruining your paint job. This primer covers crayon marks, grease stains, and dark wallpaper designs with ease. Made with a base of pure shellac, it dries quickly in just 45 minutes and can be applied using a brush, roller, or airless sprayer. The shellac-based formulation ensures reliable coverage and a smooth, flat finish. Clean-up is simple with denatured alcohol or ammoniated detergent, making it a convenient choice for your painting projects.