ChimneyRx Crack & Joint Sealant 1/2-gal

ChimneyRx Masonry Crack and Joint Sealant is a brushable, elastomeric sealant that is used to repair exterior cracks in mortar joints on chimneys and brick walls. The product seals larger cracks and other defects that cannot be corrected with water repellents alone. It seals cracks up to 1/8" wide on brick faces and mortar and brick joint interfaces to provide waterproof protection in order to minimize brick mortar repair. It dries clear to milky white, depending on the size of the crack. It prevents water infiltration and subsequent damage yet allows water vapors to escape.