For a good look, try some old school Testor’s gloss gold enamel, very slightly thinned with enamel reducer. Test on some scrap parts first. I’d leave the underlying black in place, and just use the gold to “ highlight “ whistle heads, pop off valves, etc. The highlighted look will look like a slightly tarnished brass, and can be easily done. Mask off surrounding surfaces with masking tape. Test on some scrap parts, old screws you may have lying around, etc…..when doing a repaint, this is my preferred method, as I’m not risking any damage to the components, or surrounding finishes,…..thin the gold to your taste. Just remember, the thinner you make it, the easier it will flow, so be prepared, test and know what you’re working with….
Pat
