thru hull transducer question

I mounted my Lowrance mark 4 transducer inside of a plastic container that I cut the bottom out of. Then I used duct seal around the bottom edge of the plastic container to stick it to the bottom interior of my kayak. Then filled the container with water, and put on the lid. (see photo). It's worked well for a few weeks, but yesterday I somehow managed to knock in to it, and it sprung a leak around the duct seal -- which was a pain because I pretty much had to pull it all out and start over.

Question:
Would it work to mount the transducer into a plastic container that still has the bottom, fill with water, put on lid, and then attached the container with duct seal around the bottom out side perimeter? Basically wondering if the transducer will shoot thru both the thin bottom of the container and the hull of the kayak? (note: the duct seal will not be between the two.)

Anyone tried it this way?

That won't work you will have air under the ducer.

Marine goop has very good adhesion to the plastic kayaks are made out of.

I know a few people have used the duct seal but it isn't meant to be used with constant water contact & will fail sooner than marine goop.

Hobie sells pre cut foam blocks for both the standard & DSI transducers. You can marine goop one or two of these stacked together inside your hull, stick the transducer in, & dump a small amount of water in every time you fish. I've done this on all of my kayaks with zero issues. Things like my pump, gaff, & tackle boxes are continuously bashing into the foam blocks but I've never had one come loose.

Marine goop has very good adhesion to the plastic kayaks are made out of.

I know a few people have used the duct seal but it isn't meant to be used with constant water contact & will fail sooner than marine goop.

Hobie sells pre cut foam blocks for both the standard & DSI transducers. You can marine goop one or two of these stacked together inside your hull, stick the transducer in, & dump a small amount of water in every time you fish. I've done this on all of my kayaks with zero issues. Things like my pump, gaff, & tackle boxes are continuously bashing into the foam blocks but I've never had one come loose.

+1 I've put this style transducer mount in every kayak I've owned or built for the last 5 years. The best way to mount a transducer for an in hull set up. I've never used more than one foam block. A hand full of water before you launch and your all set. The blocks are $3.99 each.

You can easily make your own "donut" out of one of those really thick pool noodles, or similar other foam. Cut the hole for the 'ducer so it fits very snugly and is gripped by the foam.  Goop the foam down and let it set a day.  Fill with water and insert 'ducer.   Mine has been in place for over 5 years with no leaks.  I used to goop the 'ducer to the plastic, but it always started to come unstuck and was not fun to scrape the dried goop off everything, even with heat.  I install my fishfinder and then load up (topside up) and drive 40 miles and unload and it works fine.  Only once did I need to open the hatch and add more water.

 

  Your current method will work fine, try using silicon sealant to glue the container to the hull.  the transducer will not work properly with any air between it and the hull.  Water is really good at preventing that.