Abstract: A thermal spray device for applying powder and polymer coatings, to large areas by means of a staged double or triple Venturi oriented at the distal end to produce a compression wave is described. The spray patterns produced by the nozzles can range from about three inches to about nine inches. The gun is designed so that the front-end nozzles are interchangeable with other front-end nozzles so as to allow for quick changes between nozzles designed to cover different coverage areas. The lightweight compact design allows for comfort and high portability.