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Painting the guard will make almost no difference in Temperature.
Painting the radiator can affect several degrees, as paint (even metallic paint) is an insulator.
Out of all the paints, black is the worst, because it converts IR, UV and visible light into heat, while white paint would reflect light rays more than absorb it.
Paint also attracts dirt, so a white radiator will look dirty quickly.

Still nothing like a stock metal radiator.
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