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.