Permatex 81878 Ultra Copper RTV Silicone Gasket Maker offers a high-temperature solution for sealing and gasket repairs. Formulated for performance in extreme conditions, it withstands temperatures up to 700°F, making it ideal for high-stress automotive and industrial applications. This 3 oz tube features a copper-infused formula that resists oil, antifreeze, and other automotive fluids, ensuring a leak-free seal. With excellent adhesion to metal surfaces, it fills gaps and maintains flexibility over time. Whether you're sealing valve covers, manifolds, or other high-heat components, this gasket maker is a reliable, easy-to-use choice.