Founded in 1849 on the principles of quality and innovation, the Zinsser® brand is known for professional-quality, problem-solving products that make the job easy and get it done right.| Get ultimate hiding power indoors and out with Rust-Oleum® Zinsser® Cover-Stain® Oil-Base Primer.| This whole-house primer-sealer is a favorite with professionals.| Use it to block stains, hide dark colours, prevent tannin bleed and penetrate and seal exterior wood.| Blocks cedar & redwood bleed.| Dries in 1 hour.| Interior/Exterior.| Sticks to all surfaces without sanding.| Seals water, smoke & nicotine stains.| FOR BEST RESULTS: Spot-prime heavy stains with the aerosol spray.