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I've used both marine goop and two part epoxy. By far two part epoxy gives you a better picture. Its not even close. The key is how you install it. Marine goop is just too soft and dampens the sonar quite a bit.
Get some adhesive putty and create a well for the epoxy. The epoxy will cure thinner and get brittle if it is allowed to spread out. Creating the well gives you a thicker section. I'm sure there are a lot of other brands but I've used ACE two part epoxy for plastic and it works perfectly. No oil canning and I've never had the transducer pop off. And I've taken some long road trips (including off road) up to the sierra's with my kayak on top. Never had a problem.
Kevin
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