Daniel wrote:
I recently hauled my boat and after few days I noticed allarming
coloured streaks oozing out of the thin crack (very thin and of little
concern by itself) between the keel and the hull.
The colour of the streaks is green-blueish, something that suggests
copper sulfate, and sort of shiny that suggests micro-cristals.

According to the boat makers the keel bolts are AISI 316 SS and the keel
is of lead.
The boat was made in 1978.

Do you have any suggestion? Do I have to drop the keel and check the
bolts? I would rather avoid it, if not really necessary.

Thank you
Daniel

Thankyou for all your kind replies.
Just to add a little more information:
1) the hull is fiberglass
2) still according to the manifacturer, the bolts are fixed in the lower
part with a washer and a nut embedded in the keel lead. It should be
possible to unfasten them.

I agree with dbohara: the colour of the ooze is quite puzzling: SS 316,
fiberglass, lead... where do copper cristals come from?

Anyway, my first try is going to be some inspection in the crack; this
weekend I will chisel off the outer layers of paint, putty end whatelse
on a limited zone to have a closer look at the interface between the
keel and the hull.

I'll keep you posted.

Daniel