Absolutely polish it ! I polished my B Pipe on a boat I rode only in salt, surf and back bays. The only regret I had was that I didn't polish it before the crinkle powder coat trapped salt and pitted the alum. Made it twice as much work polishing. The pic is after about 18 seasons of riding, and all I did after each ride was spray silicone for maintenance. End of season I would hand buff with Blue Magic. If you look close you can see that the flange head yellow zinc STEEL bolts didn't corrode even after 18 seasons, another benefit of the silicone bath after each ride. Anything I have aluminum I polish now when new. The pole I made for the same boat was also polished aluminum ran only in salt. You may have a little more work polishing something that was previously anodized, but raw alum as long as it's rinsed and treated after each ride holds up for better than painted or powder coated. Powder coat is for office furniture.
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