I have a transducer for my depth Gage and it has broken free from the bottom of the boat. what cement or glue is needed to fasten it? I would imagine that you cannot use just anything off the shelf?

I used a two part epoxy from Home Depot or I would think something like JB wield would do the trick as long as it is the slow cure.

I have had good luck with mildew resistant silicone, just clean the bottom of the boat well and apply a liberal amount, coat the bottom so that a little expresses out 360 deg around. Will never come loose.

Get some of the WEST SYSTEM two part epoxy, comes in a one time packet, they are about $3.00 and work great.

I always use just plain silicone goop. Works great, and is removeable if you change units. My old cruiser has half a dozen old 'ducers epoxied to it's bottom, with the cable clipped...

Just use lots of it, and make sure you have no bubbles...

Thanx i thought there might be harmonic issues.... i have some two part in the grage....

The two part is good.

What some people are getting at is that you don't want the fast set.

You want like a 30 minute epoxy.
This lets the bubbles out. The bubbles ruin the shoot-through.

Good luck.

you might go with the silicone route first to find the sweet location, then once you are sasified, glue'r down.

I would think that silicone would affect the accuracy. I'd go with something that isn't compressible.

It doesn't effect accuracy. Works every time. I've been doing it for 30 years. And before that, my dad did it that way on his charter boats. It works fine, and is removable.

A buddy of mine removes his transducers using Spiderwire fishing line. Just saw it back and forth while pulling under the 'ducer.

Jim