The big trick was trying to duplicate the original gunmetal anodized finish on the spokes. Since there is no way to reanodize the metal on the wheel I harkened back to my military modeling days as a kid when I used to build WWII armor dioramas for a local hobby shop and would "weather" the tanks and gear to make them look realistically "battle weary."
I used one of the old tricks of the trade, which is to do a light paint wash of the area. I sprayed a two second burst of flat black into a cup and then added a little enamel reducer. (Be very careful: as this stuff dripped on the foam wheel will ruin the finish). I used a foam brush and lightly washed the blackened reducer over the metal areas. As it dried I would daub it with a crumpled paper towel to get rid of any brush marks. I did this about 20 times. You have to be patient as each application removes about half of the previous application as the enamel reducer dissolves the earlier paint. This process worked very well as it brought out the original brushed finish in the metal.
