Black Jack Rubr-Seal 3.6 QT Rubberized Roof & Flashing Cement stops leaks fast and is ideal for extreme weather conditions. This highly flexible, long-lasting rubberized sealant is perfect for flat or vertical surfaces and adheres well in both wet and dry conditions. It can be used year-round in any weather to stop and seal leaks. Formulated to repair cracks, seams, and holes in roofing materials, it is designed for use in new construction and for setting flashings, drip edges, and other roofing edges. It seals and provides a rubberized layer of waterproofing protection, drying to a black finish.