Permatex - The Professional Solution For More Than 90 Years. Permatex Belt Dressing & Conditioner Is A Newly Formulated, High Quality Conditioner That Eliminates Squeaks, Aids In Power Transfer And Increases Belt Life. Belt Dressing & Conditioner Is Designed For Use On V-Belts, Canvas, Rubber And Round Belts. It Is Designed To Be Used On New And Older Fan And Water Pump Belts. Note: Do Not Use On Serpentine Belts. Quiets Squeaking Belts.