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transducer thru-hull problem / epoxy glass build

So i removed my old thru hull fitting which had a beveled flange. My new transducer (airmar p319) has a flush mount flange. Only about half the Ducer flange will touch glass due to the bevel on the hole bottom. My boat hull is solid glass. Im plan to seal with 4200 since its easier to remove in the future. I also have 5200 avail.

Is it possible/strong enough to just fill in the bevel flush with the hull/hole opening with epoxy only or should i really be glassing the hole in and recutting. The hole size now is perfect for new ducer just the bevel on the hole im worried about.

Thoughts on 4200 or 5200 and why?


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Re: transducer thru-hull problem / epoxy glass build

Since i cant edit i will say the flange on the ducer is flat not sure if thats called flush mount

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Re: transducer thru-hull problem / epoxy glass build

the bevel should be filled with thickened epoxy. or epoxy putty. you want the support of the fiber glass close to the 2" diameter so when you tighten the nut there is no bending of the sensor flange. I would use 4200 as 3M recommends it over 5200 for fiberglass to plastic fittings and it is good for under water use, also removable.

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Re: transducer thru-hull problem / epoxy glass build

Thank you all for the advice. I built the hole down with epoxy then used a 3 inch sanding disc to create a flat surface for the transducer flange. I used 4200 to glue it in perfectly flush against the hull. Very happy with the results, on to the next project.

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