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Lee T
1st Mate

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26 Posts
Initially Posted - 11/25/2004 :  19:56:48  Show Profile
Hi all, Happy Thanksgiving!

This morning I was installing a thru-deck fitting for wiring to pass from the mast to below decks. My plan was to drill a hole a little bigger than needed, seal the bottom of the hole with duct tape, fill with epoxy to seal the coring, then drill again. But, the epoxy kept leaking into the coring! I ended up putting probably 1/4 to 1/3 of a soda can of epoxy into the hole, and it's still not full.

So, I guess this means there are cavities in the coring around that area. It seems to me that filling it all with epoxy is probably a good thing actually. Does that seem reasonable? Do you think I should just keep poring it in until it's full? (This is a 1975 C27).

Thanks,

Lee
[1975 C27 in LA]
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 11/25/2004 :  23:05:15  Show Profile  Visit Frank Hopper's Homepage
Boatlife Git-Rot
From what I read it seems like you should keep pouring.
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Leon Sisson
Master Marine Consultant

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USA
1893 Posts
Response Posted - 11/25/2004 :  23:11:14  Show Profile  Visit Leon Sisson's Homepage
Lee,<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">But, the epoxy kept leaking into the coring! I ended up putting probably 1/4 to 1/3 of a soda can of epoxy into the hole, and it's still not full. So, I guess this means there are cavities in the coring around that area.<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">I had a very similar experience when mounting a cabin top winch. As soon as I realized I was up against a void of unknown volume, I stopped pouring in epoxy reinforced with milled fiberglass, and started pushing epoxy well thickened with high density filler into the void in small (1-shot) batches, allowing firm cure between applications. Once the void was plugged, I switched back to epoxy and milled fiberglass.
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">It seems to me that filling it all with epoxy is probably a good thing actually...Do you think I should just keep poring it in until it's full? <hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">I would avoid blindy pouring unthickened epoxy into a bottomless pit. It's heavy, expensive, and you don't know what's getting stuck to what somewhere down there... You wouldn't want to accidently encapsulate your bilge pump for instance!

-- Leon Sisson
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 11/26/2004 :  11:47:56  Show Profile
I would follow Leon's advice and not keep filling the void. When I pulled the windows from my boat, I found that there was a void around pretty much the entire perimeter of the window. If one were to fill up the coring with epoxy while installing a cabintop winch or rope clutch, one might inadvertently and permanently epoxy the windows forever in place.
Edited by - dlucier on 11/26/2004 11:48:45
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Oscar
Master Marine Consultant

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USA
2030 Posts
Response Posted - 11/26/2004 :  12:00:23  Show Profile  Visit Oscar's Homepage
If it was me I would stuff something in the hole, around the perimeter, about an inch back. Use something rot resistant, I'm thinking fiberglass insulation or something like that. Then you have something to hold the (thickened) epoxy in place. You might have to enlarge the hole a little (say 1" diameter) or whatever the fitting plate allows you, so you have room to work.

Oscar
C42 # 76 "Lady Kay" (Ex. C250 WB #618)
Georgetown MD/Fort Lauderdale FL
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.