why dont buy a can of paint and buy a gallon of water. pour down some slope and see which gets to the bottom faster. paint is thicker and more viscous then water. just think a/b that and follow the process in ur mind on painting that radiator.
what u see painted is the sides of hte heatercore and the tanks. not responsible for being cooled by a fan. The fins are responsible for that. The outside is not totally insulated. The very few front fins may be painted just for looks. but inside where the air flows through there are hundreds, maybe a thousand folding fins that maximize surface area that arent painted.
and since u believe ur black ice is fully insulated from any type of heat transfer, do u have a fan on it? of course u do. whats really the point in the fan if u say ur black ice is totally insulated?
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