Never heard of stuff you paint onto target, would like to know more about it.
I would be interested in making my own caps. I think it would be fairly easy. Corrosive is not that big a deal for having good caps on hand or the ability to have them. Flintlock would be the easiest, but I think priming compounds can be fine if handled correctly. I watched a video on how they make .22's, and they were not handling the compound with robotic arms and in confinement or anything.
Actually, it was quite the opposite. The pile of compound they were 'scraping' around was probably the size of a basketball. I'll post the link. But needless to say, if handled correctly it is not rocket science. It only becomes a rocket when you do not handle it correctly.
http://www.outdoorhub.com/stories/vi...ition-is-made/