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Sealing up that plywood is key in this install. I recommend sealing it with some epoxy resin. 5200 and polyurethane only prevent water from leaching in for so long before it fails or loosens.
A polyurethane coating will break down quickly and provide no protection to the bare plywood edges which are deeply grooved and act like a giant wick. A penetration epoxy like listed above will protect for many years. If the area in question was not a flat deck and exposed to constant moisture, caulking would suffice.
Great. Here are some pictures of the install.
Sorry for the crap quality. I have dropped my phone one too many times and dirt has worked it's way behind the lens.
I opted to cut around the deck mat so the mount would sit against a hard surface.
And one better quality picture of the boat in the water.
Yea..sorry I've been pretty absent. Found out I'm deploying in a few months. Been running around crazy trying to continue with my civilian job, military job, mandatory training, traveling, preventative maintenance on household items, paperwork & will...etc..etc.