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Black Jack all-weather roof cement is an asphalt based patching compound designed to repair cracks, seams, and holes inroofing materials. It also works great in new construction and in setting flashings, drip edges, and roofing material edges. It seals damaged areas and gives a layer of waterproof protection. To be used on roofs around skylights, vents, exhaust pipes, chimneys, valleys, and in the construction or repair of flashings, roll roofing, and shingles. Also excellent for use as a heavy-duty below grade and underground waterproofer and dampproofer. Black Jack roof cement cannot be painted. When using for larger repairs, it is highly recommended to reinforce the repair with a strip of reinforcing fabric.