HVOF (high velocity oxygen fuel spraying) liquid fuel uses an oxygen-kerosene mixture. The coating material, in powdered form, is fed axially through the gun, generally using nitrogen as a carrier gas. The fuel is thoroughly mixed with oxygen within the gun and the mixture is then ejected from a nozzle and ignited outside the gun. The ignited gases surround and uniformly heat the powdered spray material as it exits the gun and is propelled to the workpiece surface.