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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