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painting it would be pretty foolish. esp to paint it black, black absorbs all the light that hits it, so it would gain more heat. but since you're moving... yeah, i think someone needs to do some sort of testing to figure out if anodizing (i think that's what it is that colors metal without paint) will decrease it's efficiency.
but you're not pushing 1000+cfm of air at 25+psi, don't worry about losing cooling unless you're using a really small fmic with nominal boost
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