Epoxy

 What kind of Epoxy are you supposed to use for putting a transducer in the hull? I bought some Marine epoxy that said it would work with MOST plastics but after about the third time putting the yak on the car the transducer came unattached.

I use Marine Goop rather than a true epoxy.  It's a bit more forgiving and I've never had a transducer accidentally pop off.  If you can't find Marine Goop, I've been told that all of the various Goops are basically the same, just marketed for different purposes.

Brian

 I will try that. do you just put a little on the bottom or do you surround the whole thing?

There are two general methods..

option 1.) Rough up the spot you want to place the transducer, put a quarter sized dollop of goop there (try not to make any bubbles) and press your transducer into it (again try to avoid bubbles).  Hold the transducer in place until the goop drys.

option 2.) Take a piece of closed cell foam and cut a whole in it that just fits your transducer, goop this down to your kayak, hold it in place and let it dry.  Later when you get ready to launch your kayak, fill the transducer sized cup you just made with water and then place your transducer in on top of the water (try to avoid bubbles).

I've had good results from both methods, but lately I'm using option #2 because it allows me to share my fish finder between my two kayaks.  If you do a search for 'transducer' on this site or any kayak fishing site for that matter you should find plenty of discussion and even some how-to's.

Brian

I made a "dam" of plumber's putty and put the xducer in it.  That way, if/when I sell the boat, nothing that will leave marks or be hard to remove.

For what's it worth.. I've never had problems removing Goop from my kayak hull.  The plumber's putty though looks like it works pretty well.  There are a lot of options out there.