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> When you’re not operating in a vacuum, coating the bare metal with a polymer will very likely improve radiative cooling. It is, however, an additional thermal resistance between the metal and the air, so it will impair conductive and convective cooling. Detailed calculation and measurement is the only way to resolve this.
> 
> John Doty              Noqsi Aerospace, Ltd.
> http://www.noqsi.com/
> jpd AT noqsi DOT com

I would shiny surface is only good then exposed to sunshine as your space crafts.