10.1 OZ Black Jack Rubr-Seal Rubberized Roof & Flashing Cement, Gardner/Black Jack's best quality roof cement. Stops leaks fast. Best for extreme weather conditions. Longest lasting rubberized seal. Ideal on flat or vertical surfaces. Best stick in wet or dry conditions. This highly flexible product can be used year round in any weather condition to stop & seal leaks. Formulated to repair cracks, seams, and holes in roofing materials. Designed to be used in new construction and in setting flashings, drip edges and other roofing edges. Seals & provides a rubberized layer of waterproofing protection. Dries Black. 15 year limited warranty.