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Old 05 February 2015, 13:09   #1
Country: UK - England
Town: England
Boat name: n/a
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Length: no boat
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Join Date: Jul 2009
Posts: 360
Fibreglass hole repair

Not a RIB, but some of the fibreglass experts here will know..

Got a small hole (2cm) in a fibreglass boat.

The inside has cracked and on the outside the gelcoat has broken to make a small hole.

The photos make it look worse than it is

I have access to Gelcoat Repair Kit 1 - White - East Coast Fibreglass Supplies and Fibreglass Repair Kit - Clear Resin - East Coast Fibreglass Supplies

Any help appreciated.



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Old 05 February 2015, 14:00   #2
Country: UK - England
Length: 3m +
Join Date: Sep 2008
Posts: 2,071
OK you will get a range of replies. Do you want quick and dirty or back to factory new? What is boat used for, how long on water? How mission critical? Does it have residual buoyancy? Would be things to think about on how quick and dirty to go.

Personally I'd want to open that up and drill holes at ends of the cracks so it doesn't run any further.

Then I'd take the gel beck to good fibre on both in and outside.

Then a patch of CSM (chopped strand mat) with resin on the inside with probably 5cm overlap. Possible 2 or 3 layers depending on where it is, flex etc. Then on water side file the hole with some fibres in resin.
Then gel and apply acetate to smooth finish seal edges.

Remove when set. Sand. Polish buff.

Then flow coat the inside.

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Old 01 March 2015, 19:15   #3
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Country: Canada
Town: St catharines
Boat name: Seafox
Make: Nautica
Length: 6m +
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Join Date: Apr 2013
Posts: 23
Like the last reply, one should always use fiberglas mat and roving to close the hole. Depending on the original thickness of the hull, always lay it back up to the original thickness. Before applying any new fiberglas make sure you remove all dirt/paint or gelcoat to ensure good bonding to the existing bottom.
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Old 02 March 2015, 09:31   #4
Country: UK - England
Town: Hoxne
Boat name: Southern Comfort
Make: NorthCraft 5.5
Length: 5m +
Engine: 150 Optimax
MMSI: 235033276
Join Date: Nov 2005
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Old 02 March 2015, 12:57   #5
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Country: UK - Channel Islands
Town: A large rock
Boat name: La Frette
Make: Osprey Vipermax
Length: 6m +
Engine: 200 Suzzy
Join Date: May 2004
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Use epoxy resin such as West System. It will bond to anything existing whether polyester or epoxy.
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Old 02 March 2015, 13:42   #6
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Country: USA
Town: California
Make: Avon 5.4m Searider
Length: 5m +
Engine: Yamaha 90
Join Date: Aug 2011
Posts: 1,102
Why only mat? Seems a layer or two of cloth mixed with the csm would be a whole lot stronger.

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