Glassing Over Thru-Hulls - Page 2 - SailNet Community
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post #11 of 22 Old 05-08-2018
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Re: Glassing Over Thru-Hulls

The repair doesn't need to be equal to the hull strength. The boat did just fine with the thru hull giving no strength to the area. Grind a divit enough to lay in 3 or more layers of Fab/Mat with the largest piece going on first and succesively smaller pieces on top of that. Use Fab/Mat, that's cloth with mat sewn to it. Makes for a much stronger, more water proof repair. If you just use cloth could actually get leaking through the weave of even a number of layers and the layup will too resin rich. Would go with epoxy resin to be sure that you get a good bond of the patch to the hull.
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post #12 of 22 Old 05-12-2018
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Re: Glassing Over Thru-Hulls

Sorry to hear the mishap. The boatyard should have visually inspected every thru hull before removing the slings!

I agree with others that you should have a depth sounder. If you try to sell the boat, it will be less attractive without one.

Patching thru hulls is just time very consuming, itís not rocket science. If you would need to pay someone, you might consider just installing a garboard plug, which would take under an hour and would be easy to do yourself (may need a helper on other side of the hull for 15 mins). They come in handy to drain a bilge on the hard too.


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post #13 of 22 Old 05-12-2018
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Re: Glassing Over Thru-Hulls

Darryl,

I've done something like this twice. The first was when a new set of instruments and transducers where about 1/2 " smaller dia than old one. I glassed in a filler ring. The second time I had a thru hull to pull water in for a hand pump to the sink. My boat was first a fresh water boat now a salt water so I didn't want that hole. I removed the thru hull fitting, pounded a cork in the hole, ground the bevel inside and out, 5 layers of glass and epoxy, a little sanding and paint and you'd never know it was there.

John

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post #14 of 22 Old 05-12-2018 Thread Starter
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Thanks all. I ended up glassing over both. Turns out I have an externally ballasted keel which I didn't know, I thought in was internal. I was grinding my bevel and saw some shiny lead and that made my decision for me as far as glassing across the joint. I ended up making kind of a half moon repair and then really beefed up the inside.
I do plan on still using my depth sounder, I just am going to mount in inside the hull to where it's sounding through a portion of solid glass. I'd rather be a meter off in depth than have another hole that can potentially cause me problems. It was leaking too it looked like, but just much slower.
Attached are some pictures, I have to head out there tomorrow to quickly sand the fairing down and throw some paint on and she's done. Thank you everyone for the help!
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post #16 of 22 Old 05-12-2018
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Re: Glassing Over Thru-Hulls

A depth meter inside the hull does not have to be inaccurate.
I think a depth meter that is off by a meter is pretty useless.
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post #17 of 22 Old 05-16-2018
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Re: Glassing Over Thru-Hulls

Quote:
Originally Posted by paulinnanaimo View Post
I think a depth meter that is off by a meter is pretty useless.
If it is consistent, that's not so much of a problem.... YMMV
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post #18 of 22 Old 05-16-2018
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Re: Glassing Over Thru-Hulls

Quote:
Originally Posted by ottos View Post
If it is consistent, that's not so much of a problem.... YMMV
If it's consistent there is no issue at all, just enter an offset into the display or instrument system. I set mine up to display water below the keel to save people from remembering our draft and doing the math.
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post #19 of 22 Old 05-16-2018
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Re: Glassing Over Thru-Hulls

How silly of me to suggest that instruments should be accurate.
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post #20 of 22 Old 05-17-2018
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Re: Glassing Over Thru-Hulls

darryl,
What did you fill the hole with? The red stuff looks like bondo to me, which is not good to use below the water line. If is is not, just ignore this post, but if it is you should replace it with something that is designed to work below the waterline. Epoxy is best but there are polyester resins that will work.
lou
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