Rust-Oleum 265494 12-Ounce Leak Seal Flexible Rubber Sealant, Black This product adds a great value Color : black 12 oz. Aerosol Dries to a semi-smooth firm finish Coating will not sag or drip Can be top-coated with latex or alkyd based paints Great for gutters roofs flashing ductwork pvc drains masonry concrete and more Can actively build to fill gaps small holes and cracks