Are you doing this sanding by hand? The voids you reference look mostly like fairing compound that chipped off. Definitely get a hand sander or even a grinder and don't hesitate to go down to 60 grit. Feather the chipped areas back and then fill and fair as previously discussed. I would definitely plan on fairing the gap at least 4 inches wide and 6 or 8 wouldn't be unreasonable. As such, feather back the bottom paint and use a straight edge to the see what things look like so you can select an appropriate width putty knife.
Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Sat, May 4, 2019, 11:58 AM Shawn Wright via CnC-List < cnc-list@cnc-list.com> wrote: > Hi there, > > Well, she's on the hard for two weeks, so I'm attending to anything below > the waterline during this time, and puttering on smaller items inside as > well. > > The black goo is not water soluble, and seems like a sticky grease. One > guy suggested it could be some of the flexible sealant which didn't set due > to exposure to water or acetone. Both sides of the joint have been faired > with white epoxy, and the goo coincides with a few small voids in the > original layup, so possibly water or a cleaner was trapped in there. If it > continued to ooze out I would be worried, but only a small amount came out > when I cut the sealer out, and then stopped. > > Here are some photos showing the hull after pressure washing, and then > after sanding and cleaning out the keel joint. > > https://photos.app.goo.gl/YRS6RhB6iRCJmm5y9 > > There are two sections where the epoxy is separating from the keel and > lead corrosion is evident, so it has been suggested that I grind this back > to clean lead and then re-seal with epoxy. I am not sure if I should just > make the whole joint smooth with epoxy, or try to maintain a V shaped gap, > and then seal the gap with Sikaflex in case there is some movement. If > there has been moved, it is minimal, as the old black sealer was in a V gap > about 3-5mm wide by 3-5mm deep, and was well bonded both top and bottom > before I cut it out with a knife. The final photos in the album are after I > sanded with a wedge of 80 grit to clean out the joint. > > Here is the photo of the section with the epoxy delaminating from the keel: > https://photos.app.goo.gl/GMqo3PdtWHk5JuzT8 > > On Fri, May 3, 2019 at 8:10 PM Josh Muckley via CnC-List < > cnc-list@cnc-list.com> wrote: > >> You're not wasting any time are you?! Forgive me if you already >> described this boat defect but how bad was the keel joint that you are >> already tearing in to it? Most people live with a smile for a few years, >> then tighten the bolts and wait another few years, then if needed perform >> some type of additional remediation. >> >> You didn't describe if the goo was water soluble. All types of >> biological growth and slime occurs when water gets trapped and bilges are >> subject to collect lost of various liquids. >> >> Josh Muckley >> S/V Sea Hawk >> 1989 C&C 37+ >> Solomons, MD >> >> On Fri, May 3, 2019, 9:46 AM Shawn Wright via CnC-List < >> cnc-list@cnc-list.com> wrote: >> >>> While cutting out the rubbery sealant between the keel joint on my 35-2, >>> I came across a spot on the starboard side, about 14-16" from the aft end >>> of the keel, where some black goo came out. It has a consistency of grease, >>> with no obvious smell. >>> >>> Any idea what this might be? Perhaps some water in the cavity which >>> prevented the sealant from curing in that area? It only appears in a small >>> 3-4" long section. >>> >>> -- >>> Shawn Wright >>> shawngwri...@gmail.com >>> _______________________________________________ >>> >>> Thanks everyone for supporting this list with your contributions. Each >>> and every one is greatly appreciated. If you want to support the list - >>> use PayPal to send contribution -- https://www.paypal.me/stumurray >>> >>> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each >> and every one is greatly appreciated. If you want to support the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> >> > > -- > Shawn Wright > shawngwri...@gmail.com > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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