I used clear wheel lacquer on mine. But somebody will be along shortly to sell you half a tin of gold paint - run away!
Oo I’m liking the gold colour......a trip to local auto parts store is on the cards I think for today.
I like what you have done there, picking out the rib web detail and the bolt heads in another colour.
I'm with you Steve get your energy invested in making your bus go faster or some other actual improvement, who looks at a gearbox?
I have to admit that was a temporary box. Mine came back clean from being mended, it might even be coated in something, I'll have a look next time...