JB WELD Red Hi-Temp RTV 100% SILICONE Gasket Maker & Sealant up to 343°C
It will not shrink or crack, resists weathering, is sensor safe and is great for many automotive applications. JB WELD SILICONE HI TEMP RED. DO IT YOURSELF: Big or small, you can DIY it with J-B. Temperature Resistance - 343°C.