Hi Dennis- Why would you need such a high strength material on the leading edge
of a keel? This seems like a pretty low stress area. I tend to think I should
worry more about adhesion strength and the different materials have a large
range of surface preparation procedures for adhesion to the lead. I have
talked to a few people about keel repair and no one has had problems with the
repair failing and the materials have ranged from thickened epoxy with chopped
glass to marine tex putty to lightweight epoxy putties (Interlux/pettit).
Here is what I have found so far on properties
Marine Tex:
tensile strength 4000 psi
compression strength 13000 psi
West system epoxy resin
tensile strength 7000 psi
compression strength 11000 psi
One other question- is the lead keel normally coated with something before
bottom paint? I am having the bottom stripped this winter and not sure if a
primer is needed on the keel before bottom paint.
Dave
On Nov 21, 2015, at 11:03 AM, Dennis C. via CnC-List <cnc-list@cnc-list.com>
wrote:
> On a leading or trailing edge of a keel you need high strength material. A
> lightweight fairing compound won't work.
>
> I did some minor keel repair on Touche' a few years back. Just squaring off
> the trailing edge. I used epoxy thickened with colloidal silica. Microfiber
> thickener would have worked just as well. Both will cure to high strength.
>
> Dennis C.
> Touche' 35-1 #83
> Mandeville, LA
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Aries
1990 C&C 34+
New London, CT
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