Heavy duty, white rubber sealant provides the ultimate waterproofing protection from the elements. Creates permanent waterproof seal before applying Eterna-Kote top coat. Seals and stops leaks. Exceptional adhesion and flexibility. 2 hour drying time. Apply with a trowel or stiff brush. If patching before applying a coating, you must use Black Jack Eterna-Kote Silicone Roof Coating as the top coat. Acrylic coatings will not stick to this repair.