Zinsser Bulls Eye Zero Primer / Sealer is a water-based product that contains no VOCs or hazardous pollutants. It will sticks to all interior and exterior surfaces and permanently block and seal common stains, graffiti and provides a mildew resistant film. Blocks and seals stains, graffiti and tannin bleedIdeal for interior / exterior surfaces such as new or previously painted drywall, wood, masonry, siding, trim, galvanized metal and moreEcofriendly, Zero VOC, water base formula that sticks to all interior and exterior surfaces2 coats are recommended for maximum protection and can be re-coated in 1 hour