I am sure you can go to HD or a lowes and look for different paint coats that you can apply.I don't believe the type of coat will affect the sound. I would look under auto painting or auto body work.
Rack Surface Finish
I have a generic steel two shelf rack that I got very cheaply and serves my purposes. It needs resurfacing. I do not know if I should have it professionally refinished in chrome, powder coat or paint. Is this just a matter of taste, appearance or function? What should I look under in the telephone book to find the finisher? I need opinions.