Zinsser Shellac-Base Primer-Sealer is the original shellac-based white-pigmented primer-sealer stain-killer. It is suitable for interior and spot EXTERIOR use. B-I-N Sticks to all surfaces without sanding; fast dry - recoat in 45 minutes; under or over any topcoat. Any oil or latex paint can be applied over it. B-I-N seals knots and sap streaks. It blocks stains from water; smoke; fire damage and blocks odours permanently and completely. Coverage - 12.5 sq metres per litre.