From what has been written you only have water seeping from the joint, not rust stained water, that being the case I would not be too concerned, particularly knowing the boat is a Catalina 30
and that this is a known quirk. The bottom of the Catalaina 30's keel is not quite parallel to the ground and when blocked on the hard
many yards do not account for this and this puts more weight on the back of the keel leading to the forward edge of the joint opening up. Water has probably getting into the joint for years, very very slowly and filling any void or cavity that may be withing the mating surfaces of the hull and keel. When hauled, this water will seep back out, very, very slowing making it appear there is more water there than there actually is.
This part of the boat is very strong, and although you should be concerned about freeze damage, many Catalina
30's have undergone the same and continue to be sailed without repairs
The water in the bilge is just fresh water, entering from above, I would pump the bilge dry, replace your propeller
shaft packing, preferably with the teflon impregnated 'graphlex' type that can almost stop shaft drips, put the boat in the water, enjoy sailing it and monitor
your bilge closely until the next haul out
to determine if the water is leaking past the keel bolts or is fresh water from above. I think the Catalina
30 has a deck
, so water ingress down the mast
should not be a problem.
has also been mentioned in replies, if you see signs of corrosion
it will be red/orange in color in the presence of oxygen, I would not be too concerned with this and address it as needed as the corrosion probably only occured while the boat was out of the water. If however you see evidence of black or dk gray colored water, then you have a problem with 'crevice corrosion', then I would be concerned and would seek professional advice, not from a yard, particularly if they ultimately be undertaking the repairs, but from a surveyor
. This type of corrosion does affect keel bolts and in extreme cases and lead to a keel failure/loss, it also shows in iron keeled boats where the keel is encapulated in fiberglass
Just my 2 cents, I hope it helps.....