Where from?????
Do you have any idea where the leak might be? Is it a topside or hull leak? Best bet is to find out where the hell the leak(s) are coming from: thru-hull drains, thru-hull for instrument transducers, bolts holding rudder pintles etc.... Otherwise, your leak may very well be coming from rainwater: rubrail screws, anchor-locker drain hose/fitting, cockpit drain fitting, portlights etc. Without knowing from whence the leaks come, there's no use using any product(s) since you don't know where to apply it/them.