That would be by putting opposite currents through the paint and the body of the guitar IF it was metal. It would work if you gave the paint a negative charge as it came out of the can causing each drop of paint to repel the other spreading out more. But it would also require the guitar to be made of metal to attract the paint, and have a positive charge. I think I'm right?
What about a layer of conductive paint applied before the colour layer?
If you wanted to use this method, then yes. I'm not completely sure that the conductive layer would be needed though. Also, I'm not sure if the advantages are amazing: smooth first coat & paint conservation. If you want to do this, then the most important part would be running a current through the nozzle of the paint can. Also, would this not lead to an attraction by dust for the positively charged particles? All bits of dust have different charges.
I don't wanna do it, just think out loud of ways to avoid having to build the guitar from metal
i was orginally thingin of using stactic to keep the dust away