I had a similar issue. I had a bad caulking where the top and bottom of the hull meet. I had to remove the rub rail to seal it. It only leaked whenever we were getting up on plane. I’m sure it was from a rough day when the boat was flexing against a ...
Are you sure the sink drain goes outside? Some systems have the sink drain go to the waste tank directly. They put a p trap (loop in the hose) to trap water which acts as valve to prevent waste gasses from coming out the sink. You should have a waste...
