My hobie 16 is starting to come apart a little at the joint between the hull and deck, too. I think that in the fall I am going to try to fix it in this manner: first, flip it over and dremel a notch in the joint... V shaped, if possible maybe an eighth or a quarter inch deep (or until the fiberglass-resin matrix looks solid). Then, lay a thin coat of polyester or vinylester resin in it. As that begins to set, cut a sheet of fiberglass so that the strands are about a quarter inch long and mix them into enough resin to fill the notch with the resin-fiberglass mash. Next, pack it in really well with a popsicle stick and toothpicks to get out the air bubbles. Finally, tape off both sides so that the tape extends about half an inch above the sides of the joint and pour resin over the repair all the way around (just slightly above the ridge). After it sets, sand it down to a nice rounded lip. If anybody has tried this before and run into problems, please let me know. Thanks!