You should consider spray epoxy paint, it's nearly as durable as powder coating, without all the hassles, I repair music keyboards on the side, most of them I get with the rear and bottom panels rusted/scratched, I sand down the rust/scratches and spray them with epoxy paint, they end up looking new and paint is as resistant as the original powder coating and has the same look/texture, dries hard in about an hour, I use the VHT brand, they are sold at Auto Zone, colors available are white and black