KILZ ORIGINAL Primer is a powerful stain-blocking formula that blocks most heavy interior stains including water, smoke, tannin, ink, pencil, felt marker, grease, and also seals pet, food, and smoke odors. Trusted by pros for over 40 years, it has excellent sealing and adhesion properties that help paint adhere to most interior surfaces leading to better results. Use on wood, drywall, plaster, paneling, wallpaper, masonry, brick, painted metal, and properly prepared glossy surfaces. Not recommended for mold or mildew-prone surfaces or on flooring.