Black Jack® 6235-9-34 Flashing Cement, #20, 3.6 QtIt is a unique professional grade elastomeric flashing and repair product that cures to a long lasting rubber membrane. This product remains flexible through extreme temperature ranges. Its non sag properties and its exceptional adhesion guarantees that super flash is the ideal cement for the construction and repair of all flashing, parapet walls, coping and chimneys. Size: 3. 6 quart #20 Extra thick trowel grade Non sag on vertical or horizontal