Hey, this is as far as I got with a car render for Radiance.
Thought I would post it here because there is little chance I will be working further on it.
Cheated to get a gloss coat, I really did not want to use the gloss material with a high roughness setting, because at present it does not look right. Used 2 surfaces that are offset for the paint, outer spec for sharp highlights, inner gloss with rough value to emulate fleck in metallic paint.