there is one guy with a mustang a while back who used metallic flakes, it looked alright.

But another guy who had this really nice Dodge drag truck that he painted hunter green, with the "aluminim" rusto paint added. It looked fantastic! and gives that affect your looking for. All you really have to do is make sure the paint is well mixed while your rolling it on and have the right amount mixed in..

hope this helps some.