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Message: <blockquote data-quote="Piomarine" data-source="post: 474061" data-attributes="member: 16014"><p>I hadn't thought about the reaction of copper and aluminum.  I was only thinking about metal density and trying not to cut too deep into the metal.  Stainless it is.  Looking at what I have left (primer not the seam sealer I put down) would you use a open brush wheel or a knotted cup?  I know the knotted cup wheels tend to be a little courser.  Thoughts?</p></blockquote><p></p>