any good two part will work make sure you slide it in from one side turning back and forth as you do . This helps prevent air bubbles position it where it will sit flat otherwise your depth will be off. I like to leave enough room if I can to get to it again with a razor blade knife if I need to change units or transducer. don't use the super quick acting two part sets up tooo fast. Hope this helps you . oh if on an aluminum boat make sure its not above a rib and on a glass boat shoot thru just one layer of glass like back by the bilge pump...


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