I used electricians putty... Will never do it another way again. My buddy is pulling his Gooped Ducer up and doing it with putty... His isn't showing as much detail as mine with same everything.

I also suggest using the electrical putty. Less risk.. It sticks great and no worries about getting air bubbles in it. Plus you can remove it in the future.

go to home depot, pick up some silicon I apply it today and it will be dry for you tomorrow. trust me, it worked for me. arent you tired of fishing blind?

Not sure about plumbers putty but electricians putty is a brick wrapped in while plastic they have it in the electric dept at home depot. Its doesn't dry. You can push your transducer into then stick it inside your yak using the one had you can get in there. Not a problem. You could do it 10 minutes before taking it out fishing. That's the cool thing about the putty. No drying or setup time. With that being said id do it through the supper with crossbones redneck mount. What fish finder are you using?