Electrostatic spray painting
how it works
The paint or powder is given a charge as it leaves the nozzle of the sprayer. The object to be coated is either grounded or given a charge of the particles in the spray. In this picture, the paint leaving the spray gun is given a negative charge while the object has a positive charge. Electrostatic painting is better because it reduces over-spraying.
Francis Davis Millet and Harold Ransburg were both credited for the invention of spray painting. He mixed oil and white lead to make the solution. He then made a hose and attached it with a special nozzle. He proved that spray painting was much faster than painting with a normal brush. Ransburg is now a brand on most of the electrostatic guns used.