That aluminum is painted using about the same paint and processes as used on the sides. In other words, nothing special. It may respond well to a good washing and waxing. If you haven't tried that yet, that may prove to be a worthwhile investment for you. You might also look into using articles dealing with using a commercial floor wax called Red Max Pro. Many swear by an occasional coat on their properly prepared roofs.
Not sure where the dealers got the idea of clear coat.
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1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake
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