Zinsser B-I-N Shellac-base primer is a primer sealer/stain killer/bond coat recommended for application to interior ceilings, walls, doors, trim, cabinets, furniture and related paintable surfaces. Exterior uses are limited to spot priming only. May be used to block water, grease, rust, smoke, asphalt, graffiti and many other types of stains.Shellac-based primer sealerFor interior and spot exterior useGreatest stain sealerSeals knots and sap streaksSeals pet, smoke and musty odorsSticks to all surfaces without sandingLightning fast dry and can recoat in 45 mins