I was given an old laser and now found out that it's made in two parts - the top (cockpit) and bottom (hull). How was the cockpit edge sealed into the hull? There is nothing there now (I can actually move the cockpit out of the hull a little). Water is obviously going in through this gap, coming into the cockpit through the bailer. After 30 minutes of sailing there's enough water in the hull to take 10 minutes to empty through the back plug. Will using a silicone caulk (like for bathtub edge) seal the joint?