I had some firemen fish with me this past year. They scrubbed the boat for me on the trip in. Next time I came down I had water standing in the top bunk of one state room and in the dinette cabinet. Only place I could see would be the windows. They scrubbed so hard I guess they knocked some of the old brittle caulk loose. I could see places where it was missing but thought it would be bedded in the frame. Anyway I cleaned with solvent and ran a bead of clear 3M marine silicone between the frame and fiberglass on top of the old caulk. I haven't had any issues since and there have been some strong rains.