What paints better, galvanized or straight? Bumper Chrome paint?

HD calls them flats, but I don't know what they are really called.

Pieces of steel, 3 or 4 feet long, an eigth inch thick or so, and an
inch to a half inch wide.

I've used them but this is the first time I need to paint them, for
use outside. Which is better, the galvanized or the un-gal?

One pair of these things is going to be painted black for a cargo
carrier (attached to the trailer hitch draw bar) for which either I or
the shipping company lost two of the parts. If it rusts a little, I
can wire brush those parts and paint it again every few years. Or
should I use a primer?

The other is a bracket to hold rear turn signal lights that I just
bought for my still-working-on-it '69 Honda. I have a can of aerosol
Plasti-kote Bumper Chrome paint that I got at a yard sale. Never been
used.

I don't expect real chrome!, but will it at least look something like
chrome for a year or two? Or will it turn grey immediately? If large
parts of it are going to be grey, I'd rather just paint it black. The
can says "Chrome-Like Finish / Brilliant Luster", but I've seen other
chrome paint in the past that pretty much looked grey. Don't know how
old it was though.

I don't plan to ride in the rain, and I plan to keep the bike covered
whenever I'm not riding it. I've been good about that since I got it
3 or 4 months ago.

The instructions don't say anything about priming first. Do I need to
prime it? Should I prime it?

Thanks a lot.

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