For a hull/keel joint, I'd use 2-3 overlapping layers of 4" bi-axial glass tape.
Dennis C.
>________________________________
> From: Jim Watts <paradigmat...@gmail.com>
>To: cnc-list@cnc-list.com
>Sent: Friday, October 19, 2012 9:35 AM
>Subject: Re: Stus-List Keel/Hull join
>
>
>Just for clarification, there is no such thing as "glass mat cloth".
>Fiberglass comes as mat, cloth, or roving (oversimplified). Mat, otherwise
>knows as CSM or chopped strand mat, is held together with a styrene-soluble
>binder. Since epoxy contains no styrene, the binder does not dissolve and you
>end up with a very weak laminate. With epoxy, you are usually limited to cloth
>or roving, which is not a bad thing since they are stronger than mat and match
>the strength characteristics of epoxy much better.
>
>
>On 18 October 2012 17:01, Robert Abbott <robertabb...@eastlink.ca> wrote:
>
>Our boat was trucked from Racine, Wisconsin, a long ride and you have to
>assume there is going to be some movement re the keel and hull. Upon arrival,
>as expected, there was the usual keel joint crack along the front
>2/3rd.....had the keel bolts torqued which closed the gap then I took the
>angle grinder and cleaned the surface 2" above and below the crack.... then
>took 'glass mat cloth' soaked in West System resin and wrapped all the way
>around the keel and keel box (crack)....let that cure overnight and then took
>some thickened West resin and faired over the cloth....next day faired that
>with a palm sander and it has been that way for the past 7 sailing
>seasons.....no 'smile', no 'crack', no Spring hassle.
>>
>>Bob Abbott
>>AZURA
>>C&C 32 - 84
>>Halifax, N.S.
>>
>>On 2012/10/18 9:45 AM, Hoyt, Mike wrote:
>>
>>Chuck
>>>
>>>My old Niagara 26 once had a leaking joint and torquing bolts solved that
>>>but it needed rebedding. I loosened nuts 2 inches, raised boat 1.5 inches,
>>>cleaned the gap, filled with 5200, dropped the boat and retorqued. Never
>>>had a problem again. A lot easier to do in a 4000lb 26 foot boat
>>>
>>>On current boat there are no leaks and bolts are tight. I always get a
>>>small crack in fairing on leading 1/3 of keel at keel hull joint. Have used
>>>G Flex thickened with West 407 the last two seasons to refair which has
>>>helped but not stopped the crack. Am interested to hear more of the
>>>reinforced cloth style job done on Resolute. May put a couple layers of
>>>glass in rather than thickened epoxy. Joint seems sound and is not a lot of
>>>movement but would be nice to know it does not crack every year. This is on
>>>my J/27.
>>>
>>>Mike
>>>
>>>
>>From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Chuck S
>>>Sent: Wednesday, October 17, 2012 12:15 AM
>>>To: cnc-list@cnc-list.com
>>>Subject: Re: Stus-List C&C 115 new keel joint video
>>>
>>>
>>>Good video. Did they wrap the keel joint with glass? Missed seeing the
>>>fairing process.
>>>
>>>Resolute used to require an annual grind and refairing. It
never leaked, but the joint opened up each year from sailing
pressure on that long lever. When Resolute had keel work, the
yard wrapped the joint with two layers of re-enforced
fiberglass. I've touched bottom since and she remains very
strong w no sign of the old joint.
>>>
>>>
>>>Chuck
>>>Resolute
>>>1990 C&C 34R
>>>Atlantic City, NJ
>>>
>>>
>>>
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>>
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>>
>
>
>--
>Jim Watts
>Paradigm Shift
>C&C 35 Mk III
>Victoria, BC
>
>
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>
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