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Message: <blockquote data-quote="airshot" data-source="post: 514116" data-attributes="member: 1183"><p>Owned aluminum boats for 60 years, aluminum will discolor and oxidise thru natural issues.  So...the bottom line is....do you care about how the bottom looks ?  I have owned both painted and unpainted.  The real difference is the painted bottom look better and is easier b to keep looking good.  The unpainted hulls get a dull oxidized Finnish and stays that way, it does not effect performance or change life expectancy of the aluminum.  The oxidizing is aluminum's way of protecting itself.  Bottom line comes down to appearance, do you care what the bottom looks like ??  I like a painted bottom only because it is easier to keep clean on a boat that has painted sides and decorations on it. On my non painted hulls, I didn't worry about it at all.  Comes down to preference, painting had no benefit to the aluminum itself except for appearance !!  But....when selling anything, appearance can make or break a sale !</p></blockquote><p></p>