Crowies Paints - Rustoleum Zinsser B-I-N Primer is the original, shellac- base primer sealer. No product is better at permanently blocking stains, odours and wood knots! Use indoors or for spot priming exterior
Zinsser B-I-N Primer | J2940 | Anchor Paint
Paint Primer 101: Latex vs Shellac vs Oil Based - A Piece Of Rainbow