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3X: Chemistry Dura Seal is an instant leak sealer and coating that adheres to most substrates. Dura Seal features a superior, fast setting, rapid curing spray on elastomer with UV resistance that provides a flexible - no crack, no peel - coating that is paintable and long lasting. Once cured, it will help prevent rust and corrosion, withstands extreme temperatures of -30 degrees F to 200 degrees F and its anti-fungai formula stops mold and mildew growth. Dura Seal is ideal for either general maintenance or emergency repairs on roofs, drip pans, swamp coolers, cooling towers, gutters, downspouts, flashing, PVC drainage pipe, ductwork, pipes, hoses and more.