More than two decades after their frist start the thermosetting powder coatings became in 1985 a technically viable product and a commercial success. Powder coatings are 100% dry paints that contain no solvents. They are generally applied to metal substrates by means of electrostatic spray equipment that provides each powder particle with a small electric charge, which in turn makes it stick to the substrate. The coated objects then go into a high temperature oven (usualy 150 to 200°C), where the powder coating melts and reacts chemically while sintering together to a continuous smooth finish of a thermoset film.
Bodnar, E. and Taylor, P. (1986), "15 Years experience in powder coating manufacturing and practical application", Pigment & Resin Technology, Vol. 15 No. 11, pp. 10-15. https://doi.org/10.1108/eb042294
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