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Message: <blockquote data-quote="airshot" data-source="post: 517966" data-attributes="member: 1183"><p>Aluminum oxidized naturally as a way of protecting itself.  When we remove that oxidizing, we are also removing some of the aluminum  and over time by repeating this process we make it thinner.  While not pretty, it has been recommended by aluminum mfgrs to leave the oxidizing alone, or clear coat or paint the surface to keep it from oxidizing.  You will find many old aluminum hulls that have that dull old ugly finnish that is actually slowing down/ stopping the removal of the aluminum.  I choose a painted hull for appearance, but my Islanders is natural below the waterline.  Ugly yes, but no sign of any corrosion or loss of material from removing the oxidizing.</p></blockquote><p></p>