Truthfully, if you were ok with using spray paint, you could just use any type of engine paint (I can't imagine there not being any dark green engine paints) that are meant for hi-temp applications... then just use a wheel or caliper clear coat paint, I know the auto store by me has a clear coat that is "resistant to break dust," I used it on my calipers and so far I'll tell ya a little blast of water and it sprays clean.