The best way to get a very level and flat surface is to use thin epoxy... But then it may squish or flow out and allow for voids. Besides that, you MAY want to create a damn around the keel bolts. I don't think crumbling is going to be a problem. The 12000 psi coming from the keel bolts is "pounds per square inch" . With a backer of stainless washer and G10 you're going to be spreading the load considerably....that is what the backers are for.
As mentioned here before the west system epoxy compression stress is 11000 psi. Pretty close to 12000 even before spreading the load. Even if your backers were only 2x2" you'd be down to 3000 psi on the epoxy. I expect that the G10 will be 3-4 inches wide and as long as possible (~10" or more). 12000 divided by 40 square inches is only 300 psi. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD Not not hijack this tread, I changed the subject. Since we seem to have epoxy experts here. I am trying to take out some slight unevenness from the bottom of my bilge so that my keel bolt washers have an even contact. Can I use some low viscosity epoxy, just pour it into the bilge, probably dam of the area around the keel bolt with some tape, and let gravity do the leveling. We are talking maybe 1/4 in thickness at the highest point. I was originally thinking of using Marine-Tex but there are some areas which are a bit awkward to get to. The issue is that At 200 lbs-ft the clamping force is about 12,000 lbs. So I need something that will not crumble under the pressure. So the problem is to be low viscosity yet high compression strength. Thank you Ahmet C&C 25 Boston, MA On Tue, Nov 24, 2015 at 9:08 AM, Dave Syer via CnC-List < cnc-list@cnc-list.com> wrote: > In my case, was not suggesting it is superior, I just prefer to purchase > the raw materials. This way, I can use unfilled as a first coat, make a > putty for the fill, and laminate at the end. Same epoxy, sometimes even > the same batch for multiple applications/jobs. YMMV. > Dave > > On Tue, Nov 24, 2015 at 8:49 AM, David Knecht <davidakne...@gmail.com> > wrote: > >> I really don’t understand why people think that epoxy resin thickened >> with stuff to bring it to the consistency of putty is better to use than >> epoxy putty designed for the purpose. They are equally hard and equally >> stiff. Am I missing something? Dave >> >> Aries >> 1990 C&C 34+ >> New London, CT >> >> >> On Nov 23, 2015, at 11:05 AM, Syerdave--- via CnC-List < >> cnc-list@cnc-list.com> wrote: >> >> For lead keel repair I think I'd just "clean" it very aggressively with >> an angle grinder and a new, very coarse disk, then immediately paint it >> with unfilled epoxy. While that is curing to its "B" stage, mix up a very >> stiff batch of epoxy filled with fumed silica and chopped glass. Fill it >> when the first coat is gelled/tacky. if its a huge crater, i might take >> two layers, (and a real good look for structural damage elsewhere) apply >> the second while the first is at its B stage. To finish that you could lay >> light glass cloth or better, just peel-ply on top while still pliable/wet >> and fair it pretty well with a plastic squeegee. >> I've never seen the aft edge of a keel fail. In the absence of an >> issues, I'm not sure I'd worry about that. My 33ii has a very thin >> trailing edge, still intact after 30 years. >> Dave >> >> >> >> >> _______________________________________________ >> >> 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 >> >> >> > > _______________________________________________ > > 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 > > > -- ------------------------------------------- Ahmet *"S/V Waterdancer"* 1990 Irwin 43 CC "Tabasco" 1973 C&C 25 Winthrop Yacht Club, Winthrop, MA / USA ------------------------------------------- _______________________________________________ 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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