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Old 06-02-2018, 18:18   #1
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Cored deck new inspection hole

Hi all.

I own a 12 foot sailboat that I am refitting for next summer.

I need to replace some rusted bolts holding the cleats. They are bolted true.

So I have cut an access hole in the deck.



The first of 3.

I will plug those holes with Kayak inspection hatches and bags.



Now my question.

Now that I know what the deck is made of. Foam core with minimal fiberglass on either sides.

Should I resin the sides of the holes?

The lazyman in me says. Foam core = no rot. Just screw or bolt the cover in place.


What do you guys think?


Daniel
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Old 06-02-2018, 18:53   #2
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Re: Cored deck new inspection hole

Well foam core will not rot but it may absorb water, perhaps a lot of it. I would seal it.

Good Luck
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Old 06-02-2018, 19:26   #3
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Re: Cored deck new inspection hole

Quote:
Originally Posted by Gary Mc View Post
Well foam core will not rot but it may absorb water, perhaps a lot of it. I would seal it.

Good Luck
Thank you fo rthe reply.

I adn't considered the absorption.

But then the section I removed already has some water in it.

Apparently none of the hardware was done with drill-fill-drill.

The closest place for water to get in there would be the mast step bolts. Over a foot away.
So it might sound odd or stoopid but wouldn't the holes actually allow the core to dry out? For the first time in 40 odd years.


Daniel
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Old 06-02-2018, 19:50   #4
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Re: Cored deck new inspection hole

Dig out an inch or so of the foam around the edge of the hole and pack it with thickened epoxy.
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Old 06-02-2018, 20:24   #5
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Re: Cored deck new inspection hole

Quote:
Originally Posted by boatpoker View Post
Dig out an inch or so of the foam around the edge of the hole and pack it with thickened epoxy.
A+

I knew that technique for removing rot. But of course I can use it for the wet foam as well.

I will do that.


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Old 07-02-2018, 09:08   #6
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Re: Cored deck new inspection hole

Quote:
Originally Posted by boatpoker View Post
Dig out an inch or so of the foam around the edge of the hole and pack it with thickened epoxy.
And make sure the foam is removed beyond the mounting bolts.
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Old 28-02-2018, 01:00   #7
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Re: Cored deck new inspection hole

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Originally Posted by boatpoker View Post
Dig out an inch or so of the foam around the edge of the hole and pack it with thickened epoxy.
The best way to "dig out an inch or so" is to put a bent nail or an Allen-wrench in a 1/4" drill to excavate the foam to a uniform depth all round using the tool like a router bit. You will have to raise & lower the tool to make sure you clean the foam right to the F/G on both sides of the deck, but be careful not to damage the F/G as it is probably quite thin. Fill the newly cut void with thickened epoxy. Sand smooth with a drum sander. apply a silicon sealant & install your inspection port covers. Voila, you're done.
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