Grip-Rite All-Purpose 100% Silicone is a high-performance sealant ideal for a wide range of projects exposed to harsh weather. Shrink-proof, crack-proof and permanently flexible, it stretches and moves with surfaces and will never break down due to ultraviolet rays or freezing temperatures. With fast-cure, it is tack-free in 30 minutes and is guaranteed for as long as you own your home.