DON'T FORGET THE DUCT TAPE
Duct tape, Gaffer Tape, Race Tape, Duck Tape, call it what you will, it is the small boat sailor's most important repair tool. Once you've screwed the crack together, or sometimes it works instead of a screw, you simply stick it over the leaky bits and they don't any more!
Of course it can also be used to repair sails, stop chafe, to package things, and in emergencies, to dress open wounds!