You wanting to do something like this?
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Is it strong enough to epoxy to a boat and hold a transducer on a boat ?Not wanting to drill holes in the boat .
You wanting to do something like this?
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It's called transom saver
Stern saver . not the motor prop
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I have used both a cutting board and another time pvc board. Both are strong enough, and cheap. Use 3M adhesive and you will be fine.