I heard of that technique with keel scrubbing but using a wire brush with epoxy to really get into the lead. I think that came from Gougeon originally, but I don't know who first mentioned it on this forum.
Jim Watts Paradigm Shift C&C 35 Mk III Victoria, BC On 22 November 2015 at 08:24, Dennis C. via CnC-List <cnc-list@cnc-list.com> wrote: > David, > > IMO, the leading edge is subject to impact from "stuff" in the water. In > my area after a big rain event, I see all sorts of things in the lake. > Just think it's a good practice to prepare for hitting something. > > Similarly, I think a trailing edge should be repaired with high strength > material. Not sure about others, but Touche's keel's trailing edge is > shaped to a fine 1/4 inch square edge. I wanted high strength there due to > the thin shape. > > Using a lightweight fairing compound on the keel sides should fine. > Touche' has Awlfair to smooth and shape the sides and underbody. > > If the keel has been sand to bright lead, many recommend a primer prior to > painting. The lead will begin to oxidize immediately so speed is > apparently important. The neatest technique for coating bright lead I've > ever heard about is to apply epoxy with a scrubbing pad. The pad removes > the oxidation and applies the epoxy all at once. I want to say that came > from Wally but not sure. > > Dennis C. > > > > On Sun, Nov 22, 2015 at 10:03 AM, David Knecht via CnC-List < > cnc-list@cnc-list.com> wrote: > >> 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: >> >> > > _______________________________________________ > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > >
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