Mounting In-Hull Transducer

[off-the-grid]

One needs to be remounted. Of course I don't have the manual, so I was wondering what I should use?

4200, silicone, other? Kind of looks like silicone on there now.

[GordMay]

A hard adhesive transmits sound best. However, winter temperature extremes and flexing on trailer rollers can cause it to delaminate.
Soft adhesives absorb sound and will greatly reduce performance.
To compromise, use a viscous slow-cure epoxy or a fairly rigid one-part adhesive sealant.
In cold climates, a one-part polyurethane adhesive, such as Boat-Life’s ‘Life Seal’, may be best.
3M’s ‘4200' would also be ok.
Caution: Do not use “5 minute” epoxies because they are too brittle.
Do not use RTV (silicone) adhesives because they absorb most of the sound energy.

➥ http://airmartechnology.com/uploads/.../17-452-01.pdf

➥ http://airmartechnology.com/uploads/.../17-467-01.pdf

➥ http://airmartechnology.com/uploads/...ide/17-010.pdf