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i read there was a black paint that actually improves heat transfer, but i forget what it's cailled. regardless, any paint probably wont make a huge difference either way.
its too minimal of a difference to notice or even greatly effect anything, just get some thin flat black paint and hit it at an angle so you mainly just paint the bars.
that would be my suggestion, a light coat over the face of the IC, the core and fins would still be exposed behind the surface so it would still cool about as efficiently.