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For those that may search and find this thread (like I did today) the sealer I ended up using is 3M Ultrapro Autobody Sealant #8300.
A single tube from O'Reilly Auto Parts was $30.
http://www.oreillyauto.com/site/c/detail/MMM0/08300/N2356.oap?ck=Search_N2356_-1_-1&pt=N2356&ppt=C0171
For notes...
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