For a strong durable seal, professionals choose GE Silicone 1* All Purpose 100% silicone sealant. It is 100% waterproof and can withstand extreme weather conditions, such as heat, UV rays and extreme cold. GE Silicone 1 sealant is flexible, shrink and crack-proof, to help keep areas free from air and water leaks. It’s easy to apply, offers excellent adhesion and won’t break down or wash away. Whether you are a professional or a homeowner, this high-quality long-lasting sealant can help you complete projects the right away the first time. Backed by a lifetime guarantee.