G/Flex Epoxy 650West Systems G Flex Flexible Epoxy is perfect to throw in your repair kit. It will adhere to roto molded polyethylene plastics helping you repair your kayak, camp gear, or nearly anything that needs fixing. G flex is a toughened, versatile, liquid epoxy for permanent waterproof bonding of fiberglass, ceramics, metals, plastics, damp and difficult to bond woods. With a modulus of elasticity of 150,000 PSI, it is a bit more flexible than standard