Fun with paint guns, but they take quite a while to get on with it. The key points take a few seconds, and even they aren't very illuminating, just fun:
One paint gun is slow: http://www.youtube.com/watch?v=XtGf0HaW7x4#t=2m53s
Painting with many guns simultaneously: http://www.youtube.com/watch?v=XtGf0HaW7x4#t=8m12s