Thanks Brett. The guy selling Ambroid "professional" grade sounded pretty legit and knowledgeable. But I guess if you're going to scam, sounding legit is the name of the game. All this comes under the heading of I'd rather use a long bow instead of a compound bow, but I don't want to use an Atlatl. I'm interested in building those old models the way it was done, rice paper or silkspan, Ambroid or hide glue or whatever. Of good technique I guess quite a bit has been written about the use of glue and tissue and balsa -- just don't know where that's found. Not that I can't find it, but I thought I'd ask. By the way, if this is in the wrong direction for this site, I apologize. Any redirection would be appreciated. My building skills started off in a rudimentary way and never progressed much beyond that. And in terms of looking for a strong wood glue, if you're laminating wood for a bow, that is, gluing two pieces of wood together, homemade glue from a packet of Knox gelatin (just powdered gelatin and water) has been shown to be stronger than any other type of glue across different stress tests, commercial or otherwise, except for 24 hr epoxy which is just marginally stronger -- Boyer's Bible. You just don't want to use it under water, so no canoes. Hence Ambroid.
Joe