Josh,
I personally would keep a sharp eye out for any initial sign of clear water leaking especially after heavy rain or winter freeze ... but hold off. With your lack of symptoms in 30 + year boat, I would be afraid of pushing stick in hornet's nest ... Unless of course you are planning a cross Atlantic sometime soon. I am sure there are other things on your list.
I like the black rubber sticky stuff a real lot, if I had known about it 30 years ago ... it would have helped. Actually I did know about it as we used it to seal coax connectors going into radio antennas, but I didn't think.
