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Message: <blockquote data-quote="mbullen" data-source="post: 512388" data-attributes="member: 24594">Personally, I use 316 SS.   Bolt Depot is usually my first stop based on pricing, but there are dozens of other resources.    I don't use nylon for separation but I know folks that do.  Can't hurt, but I've chosen not to go that far.My boats are freshwater trailer queens and I feel that the large footprint of aluminum is more than enough to dissipate the galvanic activity of the small footprint of the SS.  316 SS is very close on the ionic transfer chart, anyway.  As for sealing, there are two instances for concern:  The sealing of the new transom wood and the sealing of the hardware in external holes.For the wood, I make sure to continue whatever sealing process was used on the surface of the wood into the new through-holes, sealing the internal passages.For the external hardware, I favor 3M 5200.  (5200 is considered permanent, 4200 is considered semi-permanent).Ultimately, you'll find many opinions, and honestly, most will be valid.   These are just my routines and after more than several restos, I feel I've had very good measures of success.</blockquote>