fibreglassing advice - SailNet Community

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Old 04-13-2013
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fibreglassing advice

Hi all. attached is images of the interior of mu sailing dinghy. the floor is fibreglass mat that has been sealed and painted. As you'll see there are parts where the glass mat are a little exposed, and some holes oozing black chemically smelling gunk.
I was hoping for some general advice on what needs doing?
sand back?
recoat with something?
and then repaint?

cheers for any links or general pointers.. Theo
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Old 04-13-2013
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Re: fibreglassing advice

Sure thats not something someone used to seal it with ? Why would this stuff ooz up ? anti gravity? Space junk atracted to the russian astriod?...Dale
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Re: fibreglassing advice

oozing due to gravity and finger pressure adjacent to hole. Gravitational hold on the boat seems normal, as long as the gravity switch is 'on'
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Re: fibreglassing advice

the interior has only been prepped and painted once. My dad built her about 30 years ago, garaged most of her life, so imagine it might be some kind of break down in the sealant??? I really have no experience with fibreglass, although I expect that is obvious!
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Old 04-13-2013
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Re: fibreglassing advice

So is this a wood boat glassed over? My dad built wood boats covered it with plywood ,He used a black non hardening pine tar with strips of linen in the joints, The out sides where then fiber glassed with polyester resin. I would think you would need to clean out the tar with acetone, sand out, then re glass with epoxy resin.....Dale
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Re: fibreglassing advice

nope, its a fibreglass hull so the floor is just the inside layer of the hull, sealed and painted.
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Re: fibreglassing advice

So clean it out. Open it up a little so when you are ready to glass it stuff is not in the mix. then repaint ...Dale
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Old 04-13-2013
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Re: fibreglassing advice

Here is a really good site with lots of HOW TO DO IT advice. CLICKY

You need to grind out [ wear a mask ] the damage and fill the holes.

Not sure about the black stuff but it might be some kind of slime mould? Anyway wash it out use acetone as a LAST RESORT as it attacks glass.

In some places like the crack next to the CB case you will to reinforce the repair with glass tape or cloth.

USE EPOXY not polyester resin. It sticks much better.

Don't worry this glass boat repair ain't rocket science.
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Re: fibreglassing advice

Last time I saw something like that, it was coming out of the roof on a sailboat with a plywood cored roof with moisture penetration into the core. Are you sure the floor sections of your boat do not have plywood core sections, over which the builder fibreglassed?

This would be a typical construction method for a home built dinghy.

So it looks like you have major water penetration into that core, and extensive rot. If I am right, I am sorry to report that your dinghy might be scrap.

However, you can check by cutting away one of the sections that is oozing, and see if there is wet wood at the core. Here there is no substiture for getting out the angle-grinder (with dust mask!) and exploring what is going on.
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Re: fibreglassing advice

I'll do some gentle surgical investigation then...
pretty sure is has no ply core. it came as a kitset- one piece hull, flotation sectionsto glass in and a whole heap of paper patterns and instructions!
the hull sat upside down for a while before my dad started the project. ,fingers crossed it aint too bad!
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