Flex Seal spray promises to seal holes and dry to a watertight, flexible rubberized coating, but can the liquid rubber really stop leaks? Flex Seal, which retails for $19.95, is advertised as a ...

JOHNSON COUNTY, IL (KFVS) - Makers of Flex Seal say you simply spray this liquid rubber onto leaks and tears. Once it dries, it instantly seals it, but Does it Work? Jennifer Ross of Tunnel Hill, ...