Transducer??

[William Novotny]

As long as there is Marine goop between the hull and your duper with no bubbles you should be good but you may want to look into a wet Mount since it is considered a less permanent way to mount inside the hull and you are more then likely going to upgrade kayaks sooner or later. In my opinion a wet Mount performs for consistently as well. Look up wet Mount in the search bar, I'm sure plenty of threads will pop up.