QT, Black, Brush On Leak Seal, Easy To Use, Rubberized Protective Utility Coating, Designed To Fill & Seal Leaks & Cracks, Provides A Water Tight, Flexible Seal That Prevents Moisture Penetration, Rust & Corrosion, Great For Gutters, Roofs, Flashing, Ductwork, PVC, Masonry, Concrete & More.