A wax spray gun and spray nozzle for discharging an atomized stream of molten wax onto a vehicle body component or other substrate comprises a gun body having an atomizing chamber within which an internal wax spray nozzle and atomizing cap are located. A stream of atomizing air is tangentially directed into the atomizing chamber to form a rotating, swirling stream of atomizing air which is accelerated through a venturi inlet formed in the atomizing cap to impact and thoroughly atomize molten wax discharged from the internal spray nozzle. The atomized stream of molten wax is then discharged from the gun body into an external nozzle which preferably comprises a nozzle body having a wall formed with external threads which carry a coil spring. A flat is formed in the wall of the nozzle body with a discharge opening therein over which at least two spaced spring wires are positioned in the path of atomized molten wax emitted from the discharge opening. The atomized molten wax contacts the spring wire and is further atomized and deflected in a diffuse pattern for deposition onto a substrate.