Once I determine the leaky spot I have a small vaccum pump I can hook up to the hull and start it. Once I have the thing going I can add the epoxy to the leak and after I see it taking into the hole I can disconnect the power to the pump so it doesn't suck the resin into the hull away from the leaky spot. Sounds easy enough. Just have to tap out the weap holes to accept a threaded nipple and I'll be ready.