Rust-Oleum LeakSeal Flexible Rubber Coating

It is an easy to use, rubberized protective utility coating designed to fill and seal leaks and cracks. It provides a water-tight, flexible seal that prevents moisture penetration, rust and corrosion. Ideal for filling large problematic and hard-to-reach areas. WARNING: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.