I've seen this done a couple of times. One was black with all the ribs polished out. Others just a aluminum-like gray.
Like all painting, it is lots of prep to get the job to go right. And then you get to maintain it. Mine was media blasted at Quella's and I find a regular spray and brush down using Gunk Degreaser keeps things looking pretty good.
No reason not to paint - go for it.
Larry
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