Glassing over old through hull openings - Page 3 - SailNet Community
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post #21 of 24 Old 07-07-2009
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Also, when you're sanding the repair fair, the chance of abrading the largest, longest fibers, which provide the most strength to the repair are much lower if the largest patch goes first.

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post #22 of 24 Old 07-08-2009
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Thanks for all the info.
One last question:
The old toe rails were in bad shape and removed. I now have many holes where the toe rails were thru bolted. Can I just fill these with epoxy thickened with 404/406?
Should I drill the holes slightly larger to get “fresh” fibers? Maybe angling the bit to flair the holes 1st, then filling with 404/406 would be better to give more contact surface.


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post #23 of 24 Old 07-08-2009
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This was useful:
Sealing Deck Penetrations to Prevent Core Rot Photo Gallery by Maine Sailing at pbase.com


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post #24 of 24 Old 07-08-2009
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I just did this on two of my thru hulls. I did it the old don casey way with about an 8 to 1 ratio of taper on the hole and 8 layers of new glass/matt alternating as i went. I used the smallest patch first then each layer was slightly bigger overlapping. Next time i'd probably do largest first because it was hard to wet out over ridges of smaller patches. I worked from the inside. started by grinding out the taper then sanded the outside edge of the hole and did a slight taper on that. backed up the hole with plastic on outside then put about an 1/8 inch layer of thickend epoxy, then laid my patches over that. lastly on the outside i used more thickened epoxy to fair then painted. I have minimal fiberglass experience but it was fairly easy. follow directions. Practice first on something less important if your not sure.
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