G-Flex Epoxy Adhesive 655-8Thickened G flex Epoxy Adhesive, 4. 5 oz. tubes of resin and hardener. It forms a tough bond on many different materials. Waterproof, flexible, permanent. You get 4. 5 oz. each of thickened G flex 655 resin and hardener. Mixing ratio is 1: 1. These are the same tubes of resin and hardener that come in the G flex 655 K Kit. Mixed G flex 655 is of a "gel toothpaste" consistency. It's still very spreadable, but stays put where it is applied. G flex is a