KILZ ORIGINAL Primer is a powerful stainblocking 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 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.