It can be though spraying miniatures with an airbrush or spray paint. I designed this spray base to be used for miniatures with a 15mm round base (like Kings of War).
Included is a plug for protecting unused places being filled with paint. Models can be easily removed through the holes.
For adjustments or remakes I included Fusion 360 and OBJ files.
Enjoy and share your makes :)
NB: take a look at my KoW paint stand for individual miniatures: https://www.thingiverse.com/thing:3700817