West System Six10 is a thickened epoxy adhesive that combines the strength and reliability of a two-part epoxy with the easy to use convenience of a single part formula.Cartridges feature mixing tips that ensure the right ratio of resin and hardener is automatically mixed upon application. Easy to apply with a standard caulking gun, Six10's unique non sagging formula lets this epoxy bond tenaciously to wood, metals, fiberglass, and concrete. Colorless resin and hardener.