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Message: <blockquote data-quote="thill" data-source="post: 512779" data-attributes="member: 4972">The biggest question is, are you strictly freshwater, or do you also venture into saltwater?In my last boat, I mounted the stainless transducer mount directly, with a square of duct tape as a barrier and a little goop sealing the fasteners for maybe 6 years with no issues.I would take that boat in fresh and saltwater on occasion, but I always rinsed it carefully afterwards.That being said, if you’re in saltwater often, crevice corrosion is a big thing.  Once it starts eating, it eats quickly.I don’t recommend decking material as it often has sawdust mixed in which holds moisture and tends to swell.  I like 3/4”-1” thick cutting board material the  best.  Through-bolt the plate and seal it carefully.When installing transducers, use 3/4”, #12 screws.    Pre-drill and take the sharp tip off the screw with a grinder or Dremel or whatever.   This is the method I’ve used for many years with 100% success, mainly on fiberglass boats to prevent transom rot, but it applies to corrosion, too.The biggest thing I like about it is that you can add, remove and change transducers without issue, and without punching a bunch of holes in your boat.I installed a transducer plate on my current tin boat.</blockquote>