Black Jack silicone roof patch is a heavy duty, rubber sealant that provides the ultimate waterproofing protection from the elements. The innovative blend has exceptional adhesion and flexibility and is compatible with most building materials. Great for making repairs on damaged roof areas, the patch can be used in both hot and cold climates. Formulated for superior performance, the waterproof seal will permanently stretch to prevent cracking and peeling, ensuring long lasting results. For more permanent repairs, add universal reinforcing fabric into the repair and cover with additional layer of sealant. One container has a coverage area of approximately 3 square feet. To apply, use a trowel or stiff brush.