Want to paint it?
You can safely paint the whole outside of the heatercore without negative effects on cooling. As for the 2 sides with the fins, take your spray paint can, and hold it at about a 10-20 degree angle to the face of the heatercore. This way, you only get paint about 1/8"-1/4" into the fins - no effect on cooling, and you normally can't see much deeper than that in most scenarios.
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