GE Silicone 2+ Window & Door 100% Silicone is a 100% waterproof sealant that is rain-ready in as little as 30 minutes. Ideal for a wide range of projects exposed to harsh weather from the attic to the basement. It is permanently flexible with a 10-year mold-free product protection. It will not discolor most metal finishes and adhere to porous materials such as brick and mortar. Guaranteed for as long as you own your home.