No compressor? No problem.

That's called a diffuser. You can't blame the guy for trying it, at least his tools weren't worth more than his car!
 
I have an old Foulis book on body work. It has a picture of a guy spraying a car using a footpump for pressure into a small jam jar with a pipe holding the jet on the top of the jar. I imagine amateur paint sprayers in the early 1950's had thigh muscles like Sir Chris Hoy!
 
Better than those devices where you took out a spark plug and connected your spray gun to the non-firing cylinder .
 
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