Hardcast/Carlisle - The Hi-Temperature Silicone Sealant is resistant to sunlight, rain, sleet, snow, ultraviolet radiation, ozone and temperature extremes. It retains design properties even after years of exposure, and seals remain watertight and weatherproof.
Stands up to temperatures from -76 to 400°F and intermittent temperatures up to 500°F
Warning: this product contains a chemical known to the State of California to cause cancer. P65Warnings.ca.gov