The internal mix atomizing spray nozzle is capable of atomizing fluids in a range of spray patterns (including narrow angle round, wide angle round and flat fan) and liquid volumes for a variety of uses. It combines liquid and compressed air inside of the air cap to produce a fine mist of atomized liquid. The 1/2 NPT nozzle provides the ability to coat, cool, treat and paint an array of products using compressed air and liquids with a viscosity of up to 300 centipoise. The device can be used with light oils, rust inhibitors, paints and dyes.