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Old 01-02-2013, 04:16 PM   #6
JerryH
Vintage Rider
 
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Joined: Jul 2009
Location: Chandler, AZ
Oddometer: 4,006
WD-40 is fine on anything metal, but it will burn off the exhaust. You just have to keep reapplying it. Or, take a rag and some engine oil and put on the exhaust. It burns off too, but leaves what appears to be a carbon coating, like on a bar-b-que grille. And the more you put on, the more it builds up. Should protect the metal on the back and bottom of the exhaust where you can't see it, might not look too good out in the open.
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