Sod all the fancy paints. Nowt wrong with maintaining the finish polished or not with wd40 on a rag. I had big ali stone guards on a cobra kit for 15 years and thats all they ever got or needed. On smaller ali bits i would go for one of these kits
http://www.ebay.co.uk/itm/2510536258... 4.m1423.l2649
Bob