Who does charging the nozzle of a spray paint can make it use less paint?

Actually, charging the nozzle of the CAN does NOT make IT use less paint. However, LESS paint is used for the JOB, e.g. spray-painting a car. But charging the nozzle of the CAN is only half of the equation; the object being sprayed MUST also be charged with the OPPOSITE charge.





Let us say that the car to be painted is positively charged. Then the nozzle will be negatively charged. As the tiny droplets are forced out of the nozzle, they pick up negative charges which will cause them to be attracted to the car. More paint will therefore adhere to the car. Hence, less paint for the job. Without the charging, lots of pain is blown away due to air pressure.





Incidentally, the paint will be more evenly distributed since the negatively-charged droplets will keep a more or less equal distance from one another before they touch the car. This will give a better finish.