LeakSeal Brush features an easy-to-use formula that creates a flexible rubber coating to fill & seal leaks & cracks instantly. Watertight seal prevents moisture penetration, rust & corrosion to ensure your surfaces are completely protected. Plus, it dries to a paintable finish for discreet use virtually anywhere. LeakSeal Brush is perfect for gutters, roofs, flashing, ductwork, PVC, masonry, concrete & more.