FWIW: From my Airmar in-hull, adjustable angle depth transducer installation instructions:
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DO NOT use an exoxy adhesive, polyurethane based sealant, or the previously recommended Boatlife(R) Life Seal(R) or 3M[tm] 4200.
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The recommend instead a silicone sealant, such as GE Silicone I or Silicone II (mentioned by name). Note, however, this is not an application where the part would be expected to be exposed to much mechanical stress or to the weather.
Jim