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Message: <blockquote data-quote="LDUBS" data-source="post: 512744" data-attributes="member: 21536">The reason I would use an HDPE pad like starboard is to avoid having to put holes in the transom.  Doing it now will at least cover/seal the holes that are already there.  If you do use the plastic pad, drill some shallow holes in the back side at an angle to give the epoxy more to bite into. My boat maker had the foresight to weld some brackets on the transom for mounting a transducer.  Because my H-Bird transducer bracket is plastic I can't share any experience about corrosion.  The SS bolts holding it to the bracket look fine.  I'm 100% fresh water so far.  If you want to mount directly to the hull using the existing holes, the paint will provide some barrier.  It might be good to further isolate the SS bracket from the hull with a plastic gasket.  Of course you already know to seal the heck out of those holes.</blockquote>