Nice thing about E-20NS is it starts to firm up in 20 minutes and you can handle the parts in an hour or so.  I use it alot.  Sticks well and is hard as a rock.  I've used long and short nozzles without problems.  I've also used E-20HP but prefer the 20NS.

Don't worry about the metal bonding thing.  It works well on plywood and glass fuselages.