Umm transducer epoxy is specially made to not have tiny air bubbles in it. Use whatever you want but if you make a large investment like a nice fish finder just pay the $5 for the right epoxy...lol is that kinda like how you "have" to pay extra for the "specially made" Optimax oil? lol. even when you use the 2-part "specially made" epoxy that comes with new units, as soon as you start mixing it together you introduce air into the mix...tiny bubbles. whatever epoxy you use, you still have to properly settle the transducer into it to push the bubbles out. i can only share my personal experience rigging my own boats with shoot-thru transducers the past 5 years. it's not hard, and i got crystal clear returns even at high speed using both standard store-bought epoxy and the epoxy provided with a new Humminbird. |