Today I discovered the cause of a leak that had been driving me my crazy. My 1981 Hunter 27 took on water whenever it rained. Water never came in from the river while at the dock. However, when sailing in a strong wind and heeled way over (to the toe rail), the boat would take on river water. Turns out, both leaks had the same cause. Can you guess what it was? Hint, it wasn't the deck/hull joint.