Essentially there isn't a good substitute for waiting for a really rainy day, and seeing where the leak is (leaks are, more likely). Water can travel a long way from the original leak.
Culprits can be any deck penetrations. I have had leaks from the stern pulpit mounts, the lifeline stantion bases, and the grab rails, all now rebedded with butyl tape after overdrilling, epoxying the holes, and re-drilling.
I have seen it suggested that talcum powder can help trace the source of a leak, but of course it makes a right mess at the same time.
Culprits can be any deck penetrations. I have had leaks from the stern pulpit mounts, the lifeline stantion bases, and the grab rails, all now rebedded with butyl tape after overdrilling, epoxying the holes, and re-drilling.
I have seen it suggested that talcum powder can help trace the source of a leak, but of course it makes a right mess at the same time.
