Thanks for the tip and the link to Custom Inflatables. I might be the "hypo-diehard" that started this discussion. (Currently taking some real heat for it on another thread too!)
These are great boats designed and manufactured by true American paddlesport afficianados. They have earned quite a reputation among the paddling faithful in the East and I have been aware of them for many years. Their Thrillseeker kayaks might be the premier IK in the world in terms of whitewater performance. I have seen several around on some of the most outrageous rivers in the Southeast - and they have all been made of PVC as far as I can tell. Their website mentions PVC several times, but I found no references what-so-ever to hypalon.
I would be very surprized to discover that Custom Inflatables regularly manufactures with hypalon, but I wouldn't doubt at all them custom making you anything you wish for a price. They advertize themselves as being a custom manufacturing shop first. The problem with hypalon in America as I understand it is in the chemical processes and our EPA regulations making it unpleasent and unfeasible to do it here, which is why they are all (almost
all?) imported now.
The hypalon posibility at Custom Inflatables is certainly worth checking into though, especially since Atilla told someone it is true. They didn't gain the respect they enjoy among witewater's faithful by not telling it like it is. And if I ever decided to own a PVC boat I would certainly consider these folks and their products above most, if not all others.