Powder Spray Gun is a thermal spraying gun to deposit metals, ceramics or cermets available in powder form on to solid work surfaces. The powder to be sprayed is fed by gravity through a metering valve and is drawn at a reduced pressure into an aspirator chamber. The powder is then propelled through an oxy-acetylene flame. The flame melts the powder and propels the fine molten metal particles towards the work surface to be deposited there in the form of a coating. The gun has several merits. As only a minute amount of the powder is lost by being blown away or consumed in the flame, the deposit efficiencies are very high, nearly 100% in some cases. Sprayed coatings are dense and uniform.

The gun can be operated both manually as well as held in a tool post for large volume automatic production. The design of the gun is such that it can spray a wide variety of powders without changing nozzle.