Now THIS was the tough part. You not only have to fill the long keel seams with epoxy on the outside --- you have to fill them on the inside, too. As the kayak is now enclosed you must rig together a long stick with a syringe filled with epoxy at the end , lay the kayak on its side, crawl in as far as you can go, and lay down a bead of epoxy on the inside keel seams. It's hit-or-miss at the ends of the boat as you can barely see, and it gets mighty hot in there wearing goggles and respirator, but I'm pretty sure I was successful. I'll find out on my maiden voyage!
From The Birthing Pangs of PITA the Kayak