J-B Weld 32509 Ultimate Black RTV Silicone Gasket Maker and Sealant - .5 oz. Sensor safe black RTV silicone gasketing material for use in mechanical assemblies Resists temperatures up to 500 degrees F intermittent and is great for automotive applications Forms a tough, oil and petroleum resistant waterproof gasket and seal on most surfaces Sets in 1 hour and will not shrink or crack J-B Weld is proudly made in the USA