This isn't really necessary, the phong material already simulates a diffuse substrate with dielectric coating.If you wanna fake a carpaint you could use a trick, copy the
body of the car, scale it just a bit bigger and give it thickness.
Then assign a dielectric material and have fun with a nice carshader
and long rendertimes.
Ford Muscle Car 1970 - V1
Very nice render psor.
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