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Message: <blockquote data-quote="airshot" data-source="post: 513889" data-attributes="member: 1183">Certain metals like brass react with aluminum quickly, like a year or two and it will corrode right thru.  Good SS and alum will take near a life time.  Even steel on alum will take longer than most folks keep their boat..Treated lumber has changed the chemicals used a couple decades back.  The warly stuff was really vad for aluminum, but the newer chemicals are so weak, it takes a long time to react to aluminum!  In fact todays treated lumber is pretty useless on the ground or even outside.  Most all the treated lumber today doesn't last much longer than regular lumber...I would no longer fear using todays treated lumber on aluminum. I have some alum trim attached to treated lumber for almost 20 yrs on my home, no sign of corrosion and the treated wood is worse off than the regular boards.  Todays treated lumber means you just pay more for nothing...</blockquote>