Zinsser BIN Shellac Primer is a synthetic shellac-based primer and sealer that provides excellent stain blocking for whole-surface priming. Great for interior use in ceilings, walls, doors, trim, cabinets, furniture, and more, and spot priming on exterior surfaces. Shellac-based formula blocks odors permanently and completely and seals severe stains from water, smoke, fire damage and more. B-I-N has tenacious adhesion which sticks to all surfaces without sanding. Dries to the touch in 20 minutes. Clean up spills and drips with denatured alcohol.