Which emergency use fibreglass matting should I have? - Page 3 - SailNet Community
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post #21 of 54 Old 01-19-2020
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Re: Which emergency use fibreglass matting should I have?

You should consider wood storm covers for ports.

The repairs I would agree with Capta... 5/16... or 8mm plywood screwed with some butyl or foam material as a sealant.

pay attention... someone's life depends on it
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post #22 of 54 Old 01-19-2020
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Re: Which emergency use fibreglass matting should I have?

Cloth and woven roving are full of holes and will leak badly unless multiple layers are used and then the layup will be way resin rich. You need mat to fill the pukas in the fabric. The stuff with matt stitched to the cloth would be what you should carry.

This is not something I'd like to do at sea. If you are worried about a large penetration, a collision mat would be the best solution. For ports the traditional emergency repair is plywood precut to the rough dimensions of port(s) and fastened with drywall or self tapping screws when needed
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post #23 of 54 Old 01-19-2020
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Re: Which emergency use fibreglass matting should I have?

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Originally Posted by Scotty C-M View Post
I've read so many times that toilet bowl wax is a good emergency supply to keep on board. I carry two of them. Slather on a piece of plywood and screw it over the hole. I've never had to do it, but it sounds reasonable.
I recently had to change a seacock in the water. Used toilet bowl wax to seal the outside. I have to say that it only worked because I was able to jam it in the hole. This was in my slip on a warm day in calm water. It would not stick to the hull at all and I don't think you'd be able to get any quantity of it to stick in the scenario suggested here.
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post #24 of 54 Old 01-20-2020 Thread Starter
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Re: Which emergency use fibreglass matting should I have?

Thanks everyone for the advice.

Another $20 saved.



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post #25 of 54 Old 01-20-2020
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Re: Which emergency use fibreglass matting should I have?

After seeing the vid posted on this site of the couple who developed a 2 ft split seam in their hull, Iím going to put a half gallon of underwater epoxy in stowage. I think itís very, very hard to punch an open hole into a fiberglass hull. However, having a split like they did seems like a greater potential, if one really rammed something. No idea how they managed to get the split. I only watched the vid of their passage and forgot who they were. I wonder if there was any followup on cause or repair.

Blowing out glass above decks is much more plausible. As many mentioned, that would require a hard cover of some sort. I have some small lumber aboard, but nothing like this. Itís not terribly practical to store a sheet of plywood big enough to cover our largest glass port. Iíve always wondered if a few 4ft lengths of a tongue and groove board would make sense. Could be epoxied together to make a wider piece as needed.
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post #26 of 54 Old 01-20-2020
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Re: Which emergency use fibreglass matting should I have?

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Originally Posted by Minnewaska View Post
After seeing the vid posted on this site of the couple who developed a 2 ft split seam in their hull, Iím going to put a half gallon of underwater epoxy in stowage. I think itís very, very hard to punch an open hole into a fiberglass hull. However, having a split like they did seems like a greater potential, if one really rammed something. No idea how they managed to get the split. I only watched the vid of their passage and forgot who they were. I wonder if there was any followup on cause or repair.

Blowing out glass above decks is much more plausible. As many mentioned, that would require a hard cover of some sort. I have some small lumber aboard, but nothing like this. Itís not terribly practical to store a sheet of plywood big enough to cover our largest glass port. Iíve always wondered if a few 4ft lengths of a tongue and groove board would make sense. Could be epoxied together to make a wider piece as needed.
You can stow plywood as large as any mattress on your boat.... under the mattress of course.
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Re: Which emergency use fibreglass matting should I have?

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Originally Posted by SanderO View Post
You can stow plywood as large as any mattress on your boat.... under the mattress of course.

Depends on your back.







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post #28 of 54 Old 01-20-2020
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Re: Which emergency use fibreglass matting should I have?

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Originally Posted by SanderO View Post
You can stow plywood as large as any mattress on your boat.... under the mattress of course.
I carry two 24"x48" sheets of plywood under the mattress as well as a fibreglass repair kit on my 21 foot boat. Doesn't take much space.

Blew a flush forepeak hatch on a 60 foot rsearch boat a bunch of years ago powering into some decent sized lumps. Took on a couple tons of water before we even noticed the hatch was stove in. Makes sense to have something. I always figured plywood, but I am sure other things might work too.
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post #29 of 54 Old 01-20-2020
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Re: Which emergency use fibreglass matting should I have?

I'd agree with keeping a piece of plywood or 2 handy over glass cloth and especially roving. That stuff is hard enough to work with and not have it start to unravel on you on a good day on land. If I had to carry cloth and epoxy it would be a few yards of 1708. Its much more dimensionally stable (and stronger) than roving. Take fewer layers (and therefore epoxy) to produce a waterproof and strong laminate.
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post #30 of 54 Old 01-20-2020
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Re: Which emergency use fibreglass matting should I have?

Have lined forepeak locker with plywood to save interior when thing get bouncy. Pieces bigger than hatches. Saloon seats are foam. Also bigger than hatches.
Drill hole through middle of ply and make hole in middle of foam
Put foam cushion over hatch with ply up top.
Put loop of rope through ply and foam.
Put boat hook through rope on out side.
Go below. Take second boat hook and place pass two sides of opening. Tie rope but leave extra for Spanish windlass.
Take large screwdriver and tighten windlass to compress foam .
Done and fairly waterproof.

You have two boat hooks on board already as well as the other bits. No expense and nothing to decontruct when you go to fix hatch.
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