The deposition of vapors on electrostatically suspended dust has been studied through the construction of a laboratory‐scale coating unit suitable for depositing coatings of high‐melting point vapors (up to 1600 °C) on dispersed metal powders in a vacuum. Following a brief discussion of electrodispersion, the physical effect by which electrostatic suspensions may be generated, the construction and use of a laboratory coating unit is described. The equipment, which is housed in a vacuum enclosure at <10−5 Torr, consists partly of systems for maintaining the powder in a state of continuous suspension and flux and partly of others responsible for generating vapors. Our laboratory equipment, which relies on the indirect electron‐beam heating of the evaporant, has a nominal capacity of 0.5‐Kg coated metal powder per day and was successfully used for the production of powders treated with zinc, silver, tin, gold, and palladium. In discussing the potential for industrial scale use, it is shown that the process parameters of such a unit may be calculated with relative ease and it is concluded that a scale up to industrial size is feasible.