Thick silicone dielectric compound paste that facilitates and improves tune-ups. It prevents voltage leakage around electrical connectors.LOCTITE LB 8423 is a translucent, thick silicone dielectric compound paste that facilitates and improves tune-ups. It prevents voltage leakage around electrical connectors thereby ensuring a strong spark in high energy ignition systems. Also an excellent lubricant on rubber, plastic and ceramic surfaces, it has an operating temperature range of -67 °F to +399.2 °F (-55 °C to +204 °C).