I need to replace a rotten transom on my 12ft jon. I don't own a rivet gun, so would like to replace the rivets with some sort of bolts. The rivets that will have to be replaced are, for the most part, above the waterline. However, with a small jon boat there is really no part of the hull that *isn't* under the waterline at some point!<br /><br />Are there some sort of waterproof washers or something of the sort that are commonly used for this? What type of bolt would be the best? Of course it would be stainless...<br /><br />Thanks,<br />Brian