Don't know if this is what Dart69GT meant by "power packs", but it's possible to get automotive paint packaged in an aerosol can. I've read that professional paint supply houses will do this.

I've also seen places on the web that advertise this. You can supply a factory color code and they will supply an aerosol that matches.

I even recall seeing a special aerosol setup that had a device where you popped a seal on the can right before spraying, to release the hardener into the paint (if that's the type of paint "system" you're after).