[sathackr]

Something always leaks. If anything just the packings around the propeller shafts (though since this is a sailboat it may not have propeller shafts).

And there is maintenance. Even if you seal up all of the leaks, something will always degrade and start leaking. If you are away from the boat for weeks at a time, you may find your leak-free boat on the bottom of the harbor.

So yes, you could conceivably find and seal every single leak, especially if you don't have a rotating shaft that penetrates the hull, but it would not negate the need for monitoring.