Another post resurrected! Hallelujia!
To your question-are those parts chromed? I would strip them as was discussed above, and then paint them with a gold metallic. If they're not chromed, of course, you can skip the step to strip them.
I stripped the chrome from the chromed sprues in the old Monogram Red Baron hot rod, by the way, because I wanted to be able to clean up seams and sprue gates on chromed parts (eg, the fuel tank, the helmet roof). I used the automotive degreaser SuperClean to do that. I put the sprues in a glass dish and filled it with SC. It dissolved the chrome in about two minutes. It left the parts literally squeaky clean, no chrome and no grease on them. I handled them like any other parts, but sanded and polished them when it came to painting. I used Krylon chrome to paint them again.
Hope that helps!
Best regards,
Brad