Honestly any regular spray paint should be fine for the case, it doesn't get that hot (except the cylinder jugs) I'd use high heat BBQ paint if you want them black or silver. Or step up a notch and see if theres a Finishmaster near you. They do an activated paint spray can thing that works REALLY well.
You bang the can to get the activator mixed, then you have 24 hrs to spray, any custom color you want, including flex additives, wrinkle finish (I'd recommend that), and heat resistance. IIRC about $26/big can
Hell yea brother!