In our experience with the fleet here on SF Bay (my own experience included), the hull to deck joint leaks and the problem started appearing back in the late 1960's. It may have become obvious to us since we sail rail down most of the summer. Over the years, all manner of fixes were attempted, each getting better as epoxy & sealant technology progressed. (And yes, the fixed lites will leak, but that is in addition to the hull to deck leak.)

Several local skippers have found good results (as described in the manual) by cleaning out and epoxying the seam, then finishing with 5200 when reinstalling the ss trim/rub rail.