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Best thing I ever use on my black hull is Poly glow. Remove all the old wax wet sand with 800 then 1000 until you get a uniform color. The apply Poliglow in fresh water mine lasted for two summers, then you can recoat as you needed
Never heard of anyone using rain-x. May have to try that. Let us know how it turns out. I have a black 280. Nothing better than a clean black boat... But have to agree.. A pain to keep it that way. I tried Flitz also.. Looked great for a day. The one thing I swear by at this point is meguires oxidization remover and meguires flagship marine wax. So far so good on the boat. The oxidization remover seemed to work better than the compound. @elarson5757, what year is your boat?