Guys, Gals, and Gearheads,
I just had a great experience in a bead blasting cabinet with all of the
above. Glass media blasting is wonderful, even, non-toxic, etc. If you
have access to a shop, use it! Look under sandblasting and ask. I got mine
done by a friend at a wheel shop. Commercial guys will charge money bit if
you get some club members together you can do an awful lot of parts for
their (normal) 1 hour minimum charge.
The result is a grease free, factory appearing casting which you can THEN
finish as desired. The aluminum colored paint is very close in appearance
but still will not adhere to grease.