Homebrew PCBs

Maybe I'm a little out of sync with the conversation, but my first 
thoughts involve air and suction. like a siphon feed on paint guns and 
sand blasters. a valve to control air flow, two plastic pipe joining at 
a slight angle to form the suction. a tip for the spray pattern. Sort 
of a large version of the cheap plastic model car airbrushes.
Any thoughts?