The Epoxy Gun is the core of System Three® Goof Proof Epoxy System, which brings ease of mixing and dispensing together in one system. It all begins with the Goof Proof Epoxy Cartridge that contains one of System Three’s 1-to-1 ratio mix epoxies. Load a cartridge into the Goof Proof Gun, attach a mixing tip, squeeze the trigger to advance the plunger, and out comes premixed epoxy, which you can use to fill voids, cracks and holes with ease or to put just the right amount where you need it for repairs. Reuse a partially empty cartridge by removing the tip and replacing the cap to preserve the remaining glue for another day, or simply toss an empty cartridge. Replace with a new cartridge and tip and keep gluing.