Epoxy Kit G/Flex ToughMfr #: 650 8 G flex 650 is a toughened, versatile, liquid epoxy for permanent waterproof bonding of fiberglass, ceramics, metals, plastics, damp and difficult to bond woods. G flex adheres tenaciously to difficult to glue hardwoods, both tropical and domestic varieties. This is important since many of the exotic and tropical species now being used to replace traditional woods present bonding challenges. G flex has the ability to glue damp woods. It