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Hard coat anodizing, not regular anodizing, would be the best, but not cheap. It actually penetrates the surface of the aluminum. They would have to strip the coating first then hard coat. Powder coat is more of a surface covering IMO. I can't see the powder coating lasting very long in a marine environment. I am a machinist in oceanographic biz so I am familiar with this.. I made some aluminum lures a few years back and had them powder coated and they didn't last long. Just not durable enough for saltwater environment IMO. Paul
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