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Exactly, the "dip" tanks.  My products filter the paint (think of under your sink filter, but they are about 4ft tall and 8" in dia and then we make the anodes that are charged positive and the car body (or part) is negatively charged. Think of powder coating, but liquid form where the parts are submerged in paint.

Interesting fact - I have been to a Ford plant and have seen cars painted by robotic sprayers (10+ years ago) and I shit you not, they are about 3-5 feet apart and the car coming down the line is painted BLACK and the next car is white.  Below the painting area are huge down draft fans (like real deep) that suck the over spray.  It is weird seeing that.  I can not believe how close they are and not get over spray. 

90% of the stuff we paint are first coat (black gray white), only products like Toro and John Deere ECoat their actual final color.  Washing Machines are like this too.  Only one coat of white paint.