Titebond Professional Radon Sealant is specifically designed to reduce the entry of radon. It should be used on foundation cracks, joints and penetrations, around foundation coatings normally used for damp proofing, and membranes surrounding the foundation. It is an extremely flexible and durable product which allows for extension and compression of at least 25%. The mold and mildew resistant formula dries quickly and can be painted within 2-4 hours of application. Titebond Professional Radon Sealant is a VOC-compliant formula containing no added ozone-depleting chemicals, making it safer for you and the environment. It is nonflammable, emits no harmful fumes and cleans up with water.