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Discussion Starter · #1 ·
Hi all...probably not the first to ask about this but couldn't find an answer in the forum.
I have a Beneteau First325 and am replacing depth, speed, and wind instruments. Pulled old thru-hull transducers and found that the new transducers are 1/8" smaller in diameter. Was considering building out the extra 1/8" by laying layers of fiberglass and resin on inside of hole walls...figured a few layers would probably build out the 1/8" I need. I'll be using the West Marine sealant(their version of 3m 4200) to seal the flange to the underside the boat and then fill the threads of the transducers with the sealant as per instructions.

Thoughts?
 

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An 1/8 of inch doesn't sound like much. I am assuming there is enough of a flange on the new transducers to support them and you are just trying to take up the gap. If so, I think your approach is fine. If you need more support, then a more substantial structural repair is called for.
 

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Minnewaska, the inner face of the mushroom fitting should be sealed against the hull, this is what prevents water ingress.

Using these instructions as an example, they show where the waterproof marine sealant should go :

http://www.airmartechnology.com/uploads/InstallGuide/17-355-01.pdf

Think the OP mentioned he's going to do this.
 

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Discussion Starter · #10 ·
Thanks for all the feedback. I ended up laying a few layers of fiberglass mat and resin across a few days. Sanding between layering. It seems to have worked. I got the hole down to a diameter where the transducer housings fit snugly. Used the West Marine sealant on inside of flange of housing on outside of boat with LOTS of sealant up the threads of housing. I forced some sealant from inside the boat down into gap between housing and hull. Really no gap to speak of but we all know how that water will find it's way.
It seems to have worked out well. However(BIG however) the boat doesn't drop until next week. I'll be onboard with fingers crossed when it does.
 
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