One thing I've not seen mentioned in the discussion about polyurethane glues is the fact that they produce a 'flexible' joint.
If you take two thin pieces of wood and glue them together with epoxy the finished work becomes stiffer. If you take two thin pieces of wood and glue them together with a poly adhesive you'll find the finished work is more flexible. Glue two comparitive large pieces of work together and the difference is really apparent! Epoxy by nature is hard when it cures, poly adhesives are not. You'll understand this immediately when you go to scrape excess of the two off your work bench. So, in my experience, use 'hard' glues on major components that will experience load and therefore possible flexing, and use 'flexible' glues for bonding small blocks, foam, templates etc in place. Just my two cents worth. PJ
