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If people are worried about aluminum rubbing off (and I am OCD enough that I don't like it) then pick up a roll of 3" Surface Guard tape from Amazon. I lined the bottom of all my rails with this and it keeps most of the oxidation from rubbing off on my boat.
https://www.amazon.com/Allstar-Perf...717&sr=8-1&keywords=3+inch+surface+guard+tape
https://www.amazon.com/Allstar-Perf...717&sr=8-1&keywords=3+inch+surface+guard+tape