This Standard is concerned with flammable and combustible finishing materials when applied as a spray by compressed air, “Airless” or “Hydraulic Atomization”, steam, electrostatic methods, or by any other means in continuous or intermittent processes. It also covers the application of combustible powders by powder spray guns, electrostatic powder spray guns fluidized beds, or electrostatic fluidized beds. It does not apply to outdoor spray application of buildings, tanks, or other similar structures, nor to small portable spraying apparatus not used repeatedly in the same location.