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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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How about digging out a quarter inch of core material from the inside of the hole, sealing the bottom of the hole, filling it with thickened epoxy and re drilling the correct size?
 
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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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It won't be cored.
Perhaps not with wood, but I was referring to whatever the core of the hull is made of, something is between the gelcoat. It's just the concept of creating a groove to hold the epoxy.

If I were sealing this over permanently, I would glass it from the outside too.
 

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The Beneteau 235 does not have a cored hull, it's solid fiberglass. I think your method is spot on.
 

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Perhaps not with wood, but I was referring to whatever the core of the hull is made of, something is between the gelcoat. It's just the concept of creating a groove to hold the epoxy.
Fiberglas through and through with gelcoat on the outside.
 

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Fiberglas through and through with gelcoat on the outside.
Terrific. Then the core is fiberglass. Dig the groove in that. A router would do a good job.
 

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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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