Epoxy substitute. A commercial tyer tipped me off to a product called "Allene's Fabric Fusion". It requires no mixing, dries clear, and is thicker than epoxy, so less care is required to keep it in place while curing. I have used it, with good results on Copper Johns, and have seen it used quite successfully on saltwater patterns. I would say it could be used wherever epoxy is specified. It is available in most craft and fabric stores for about 8 bucks for a good sized bottle.