Permatex Permatex Dielectric Tune-Up Grease is a high-temperature, silicone-based lubricant designed to protect electrical connections and components from moisture and corrosion. It is specially formulated to provide a non-conductive barrier that prevents voltage leaks, arcing, and shorts in electrical systems. This grease is ideal for use on spark plug boots, battery terminals, distributor caps, and other electrical connections. It also helps to extend the life of ignition parts and improve engine performance. This product is safe for use on all types of vehicles and is resistant to water, heat, and chemicals.