Don't know what the restorers are using but I've built a few wooden (spruce) airplane wings and used Resorcinol glue, that can hold up to the weather and that is what all the old WWI and WWII wood structures were glued up with.
You might try a few wood forums like this or ones that are geared toward homebuilt aircraft. http://www.kayakforum.com/cgi-bin/Building/Archive50.pl/noframes/read/57958
The aircraft supply houses will have good wood glues for your purpose. Try here for a start. http://www.aircraftspruce.com/search/search.php and search for “glue” on their site.
Denny Graham
Sandwich, IL


Denny G
Sandwich, IL