I powder coat almost exclusively, with a few exceptions.
My favorite machines to restore are tab gum machines. Powder seems to make them pop.
Also, any slot that has a black-wrinkle finish or gray hammer-tone finish, I will powder coat those. Other colors, not usually.
Here are a number of gum machines I restored in powder. With the Pulver, I powder coated the yellow, made a graphics stencil, then rattle-can-brown painted the graphics. Then an overcoat of automotive semi-clear to give it the final appearance.
Slowly building a knowledge base on E2000 series Bally machines and J400 Jennings. Started with the antique Mills and Jennings. Getting there...