I probably wouldn't paint the fan, unless I was going to go through the extra effort to have it balanced again. Even though may look nice, you maybe inducing another problem. The thickness of the paint will add some sort of weight variance causing it to spin off balance and vibrate. What could possibly happen is premature bearing wear and cracking of the fan blade. Worse yet, you could have catastrophic failure of the fan and a blade shoot out of your engine lid.
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