I dont know that much about fixing the bottoms of the hulls, thats why I posted this thread. (although I think i finally figured out everything I need to do, thanks a lot guys) But anyway, as far as other leaks, as has been mentioned in other threads one good way is to cover the hull in soapy water and run air in through the drainplug. I actually took an old drainplug and attatched a valve to it so I can hook it up to an air source. If the hull leaks then you shuoldn't run a danger of putting too much pressure in it, but keep an eye on the pressure anyway just to be safe. The places where the soapy water bubbles are the leaks. Suspected places are the bottoms of the hulls, the drainplug seals, the rudder assembly attatchments, the deck/hull joint, and the points where the 4 posts that support the frame go into the hulls. Supposedly once you get everything sealed right the hull will actually hold a little bit of pressure and you will hear a pressure gradient equalizing everytime you take out the drainplugs after sailing. My hulls have never been that well sealed though, so maybe you should get more advice from some of the mose experienced people here.