According to your product shapes ,for example it is complex workpieces or simple product to choose the machine function, for example colo-500star compare with other higher price equipment ,it not so good when spray the corner or do recoating

Or when spray specially metallic powders ,but for mostly work the colo-500star do

Good job too.

and according to the coating job details for example need to change colors often or only few colors to choose the box feed unit or hopper feed unit ,and choice the hopper size