RUST-OLEUM 279614 8oz. Stops Rust Leakseal Brush-On Paint, Crystal Clear It is an easy to use, rubberized protective utility coating designed to fill, seal leaks and cracks It provides a water-tight, flexible seal that prevents moisture penetration, rust and corrosion Great for gutters, roofs, flashing, ductwork, PVC, masonry, concrete and more High build formula that seals leaks and cracks instantly Ideal for filling large problematic and hard-to-reach areas