My brothers boat has quite a bit of water in it after each run, not enough to mess up the cog or anything but enough to worry about. So today I put it in the bath and watched it for a while, looking it over and found out where it's coming in. It's coming in at the very rear of the boat where the two havles of the hull connect, is there a way to seal this up? Ca glue or what would u guys recommend? Boat is all plastic!