JB J-B Weld 31314UK - Hi-Temp Gasket Maker & Sealant Red RTV 100% Silicone RM48P
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. Colour When Dry - Red.