HVAC RTV Silicone Sealant is a superior quality silicone which remains flexible from -40degF to 350degF. Never dries out. Has excellent adhesion to metals and can be used for virtually every HVAC need.
Mars® RTV Silicone Sealant, 10.1 oz Net Content, Paste, White, 1.04 Specific Gravity, -40 to 350 deg F