clear coats will almost all tint the bare metal to some degree,
they're not 100% clear. they usually have a slight amber or silvery tint. (there are some that are 100%, but I've never seen them in a spay can and most likely need other paint to adhere to.)
It isn't noticible on most stuff as there is a color and/or not near as much shine as bare metal.
Acetone should clean the copper, you should also wash it with soap and water after.
2000grit is too high for the clear coat to stick to bare metal.
Have you thought about just waxing it? if it's not going to be in contact w the cpu and all that?
I used 1/4 in copper pipe for curtain rods. I just buffed the crap out of them (hard to do to round objects) then used carwav on them. It has the added bonus of entertaining me when the cat tries to walk across them.
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