GE Silicone 2+ Metal 100% Silicone is a 100% waterproof and weatherproof sealant for exterior projects with metal applications. It applies to wet or dry surfaces, can be exposed to rain in as little as 30 minutes and cures in approximately 24 hours. It is permanently flexible and will not shrink or crack when subject to ultraviolet rays or freezing temperatures. Adhere to porous materials such as brick and mortar. Guaranteed for as long as you own your home.