Stus-List Black goo in keel joint - 35-2

Shawn Wright shawngwright at gmail.com
Sat May 4 11:57:31 EDT 2019


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 at 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 at 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
>> shawngwright at gmail.com
>> _______________________________________________
>>
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>
> Thanks everyone for supporting this list with your contributions.  Each
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> use PayPal to send contribution --   https://www.paypal.me/stumurray
>
>

-- 
Shawn Wright
shawngwright at gmail.com
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