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Putting 1.25" thru hull in 2" hole

Old 11-17-2016, 06:07 AM
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Default Putting 1.25" thru hull in 2" hole

Putting a new CPT-110 in place of an old speed/temp sender that's leaving a 2" hole. Any thoughts on the best way to do this? Initial thought is that the deadrise block will cover the gap and I can use a stainless plate inside the hull as a backer. Maybe cut a doughnut out of stainless to fill the gap and a good amount of 5200. Is that a reasonable solution? I'm guessing fiberglass would be best but I know I'm not the first to have to figure this out...
Old 11-17-2016, 06:18 AM
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just fill it with some thickened epoxy and re-drill. IMO using some sort of a spacer contraption is a recipe for disaster. There are any number of epoxy products that would work, you don't necessarily have to "glass" it back together. You're just trying to get a solid bond with the hull. You could always glass it on the inside for some extra insurance.
Old 11-17-2016, 06:31 AM
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Hello. You absolutely must fill in the original hole first, do not attempt to use any backer or spacer or doughnut, must be a solid hull. Epoxy thickened with colloidal silica or you can get fillers mixed with chopped strand mat, maybe Kitty Hair would work, I would try and get a piece of wxed ply or ply with some waxed paper on the outside and fill from the top down. Hope this helps.
Old 11-17-2016, 06:35 AM
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Have you considered leaving the old speed/temp sender and installing the ducer forward of it?
Old 11-17-2016, 07:00 AM
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I would not use filler alone, you should scallop out the the hole and layer glass on the outside otherwise the filler could fall right out
Old 11-17-2016, 07:06 AM
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Originally Posted by CMEBoston View Post
I would not use filler alone, you should scallop out the the hole and layer glass on the outside otherwise the filler could fall right out

agreed :thumbs:
Old 11-17-2016, 07:07 AM
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Originally Posted by CMEBoston View Post
I would not use filler alone, you should scallop out the the hole and layer glass on the outside otherwise the filler could fall right out
X2 !

Leave the old or get someone to properly repair the hole!
Old 11-17-2016, 07:10 AM
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Please glass it in properly and then drill a new hole
Old 11-17-2016, 08:18 AM
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Maybe I don't have a full picture but sounds like the mating flange of the new ducer would cover the "old" hole. If that's the case I don't see why this guy needs to get into layering glass and re-gelcoating the outside hull. Not like we're talking about filling a 5" hole to drill a 1" hole. Its 3/4" so the margin that's actually around the hole 2/8.

I do epoxy repairs all the time on my boat, the crap is insanely strong when done right. Heck... you could get a little piece of fiberglass board and plug the hole so the thickened epoxy is just in the small space between the two. Glass it on the inside and off you go. So long as the outside mating flange covers the seam I would not get into fiaring anything on the outside... but I'm no expert.
Old 11-17-2016, 10:12 AM
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Originally Posted by InternationalMarineBrian View Post
Please glass it in properly and then drill a new hole
Come on Brian..... I heard you could plug a 2' hole in an offshore boat with baby power mixed with nail polish!
Old 11-17-2016, 10:16 AM
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Originally Posted by CMEBoston View Post
I would not use filler alone, you should scallop out the the hole and layer glass on the outside otherwise the filler could fall right out
X4 do it right
Old 11-18-2016, 05:28 PM
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Thanks for the recommendations. I called Discount Marine Supplies for a suggestion and bought West Systems G-Flex resin and 404 High Density Filler. Going to look at the possibility of installing it forward of the existing transducer though.

Thanks!
Old 11-18-2016, 07:12 PM
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Originally Posted by CMEBoston View Post
I would not use filler alone, you should scallop out the the hole and layer glass on the outside otherwise the filler could fall right out
Old 11-18-2016, 08:19 PM
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glass!, glass! yes. thickened epoxy no, no!!!
Old 11-19-2016, 04:40 AM
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Glass the hole from the inside with several layers for strength then epoxy filler the outside then a lyre of glass over that redrill hole. It's the bottom of the boat the peace of mind will make you feel better when your out fishing on a rough day
Old 11-21-2016, 09:36 AM
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I went the easy route - put it a few inches ahead of the existing speed/temp sensor...

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