Zinsser B-I-N vs Cover Stain: Which Stain Blocker?
By The DIYPicks Team · Updated July 2026
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Zinsser B-I-N Shellac-Based Primer & Sealer
The go-to when you need to seal severe stains, smoke, or pet odors fast on interior surfaces.
| Type | Shellac-based |
|---|---|
| Recoat | 45 min |
| Coverage | ~100-125 sq ft/qt |
| VOC | High (~550 g/L) |
| Cleanup | Denatured alcohol / ammonia |
| Use | Interior + spot exterior |
Zinsser Cover Stain Oil-Based Primer/Sealer
A high-hiding oil-based primer that blocks tough stains and tannin bleed on both interior and exterior wood.
| Type | Oil-based |
|---|---|
| Recoat | 1 hr |
| Coverage | ~400-450 sq ft/gal |
| VOC | High (~450 g/L) |
| Cleanup | Mineral spirits |
| Use | Interior & exterior |
Our verdict
Choose B-I-N (shellac) for the toughest interior stains and odors and the fastest recoat — it seals smoke and pet odors better than anything. Choose Cover Stain (oil) when you need exterior capability and easier handling with slightly less aggressive fumes. Both need solvent cleanup, but B-I-N wins indoors on odor and stain sealing while Cover Stain is the more versatile interior/exterior tannin blocker.