Well, I looked at the drum rack and still don't know what it is, lol
. But that appears to be polished aluminum or steel. Not sure what this thing is for, but I'd consider getting a sanding wheel and using it with a drill to polish it or start out with sandpaper that you can wrap the tubes with. Unless you've worked much with sand paper, realize there is a big difference in the grits. Start coarse and work up to finer for the smooth finish.
Not sure if you are wanting a paint or a plastic coating for these tubes, but you might also consider a rubberized coating (like some hand tools have - they've been dipped in a liquid coating that dries like rubber). This product is called "Color Guard" and it's made by the Loctite Corporation which is now owned by Permatex. This product started out in the industrial field and now is available through some hardware stores, etc. It comes in a variety of colors. It is a good product and I've used it myself. It is available in gallons, but quite expensive, Also available in quarts. If you are interested, check with an industrial supplier and you'll probably get your better price there. Or check it out
Actually, I just looked up up on line and you can get the color guard at www.restockit.com
at good prices....14.5 oz can for $10.00. Much less that it was some time back, how unsual, but it is a really good product. (I used to sell Loctite products - they're all good)
As far as using other paints on metal, keep in mind, you cannot paint metal under 60 degrees. It will not dry, cure or harden and you'll have a real mess on your hands. (my bro does auto/body work)
Like most things, time and expense involved plays a part in how we do our projects. So this project can involve a lot of both depending on which route you decide to take. But good luck....where there's a will, there's always a way.