904 BIN INT/EXT PRIMER SEALER, QT | 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.