Can you describe more accurately what "powdercoating" means?
In short, the waterblock is made of copper, one of the best material one can get for the price. Adding anything to this very good material would serve no purpose whatsoever, and can in no way improve the performance, because it would only add another junction through which heat would have to travel through.
I even advanced the idea of electroplating silver, but it turns out (theoretically) that it won't do any good, even though the electroplating process is about as close as one can get 2 metals together, without melting/fusing them. Besides, the waterblock would still perform as well as the least performing part of its composition: the copper.
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