Chimney Rx Elastomeric 1/2 Gallon Stops Leaks Around Chimney Flashings, Skylights, Stacks, & Vents Remains Permanently Flexible to Stop Chimney Leaks Easy Brush-On Application (Brush Not Included) Ready to Use, No Mixing Required, Cleanup With Soap & Water 1/2 Gallon Covers 14 Sq. Ft.