That doesn't appear to me as anything but a typical flexing at the keel stub which caused the fairing compound to crack away. The remediation which you've done looks good. Use the G-Flex to fill joint level. G-Flex is the perfect solution for your situation since it is strong and tough. You may want to expose a slightly wider areas away from the joint just to allow for a nice tapered transition. You'll probably find that more than one application is needed which is totally fine. Don't let the previous application complete cure before applying more for the build up. If really needed you can even thicken G-Flex. Kinda depends on how deep it ultimately is. When applying to raw lead, clean the area appropriately and then use a disposable wire brush to scrub the G-Flex into the raw lead. Lead oxidizes so quickly that doing it this way cuts into fresh lead and immediately seals it from oxidizing. In this manner I imagine a "primer" coat, lightly cure, followed by a filler coat, lightly cure, followed by a finish coat. If you are careful with your trowel and get a clean look from the filler coat then the finish coat is really just to get a final smoothness. While it is still tacky apply your bottom paint of choice. Doing this gets a good bond with the bottom paint. Otherwise the paint may flake of in the areas of the epoxy. Also remember that you can put hard paint on hard paint, soft paint in hard, and soft on soft, but not hard on top of soft. If the boat already has soft then you really need to select another soft paint.
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 > >
_______________________________________________ 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
