You can powdercoat all except the bottom. Powdercoating helps prevent exterior corrosion (the difference between the black edge and jagged edge on becooling). You CANNOT do this on the bottom because your thermal transfer will plummet. Further, it will slightly inhibit any air cooling (miniscule) from the outside of the block. The nice thing is that it won't leave finger tarnish all over the outside of the block. It's mostly an asthetic thing.
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