It may be a polyvinyl wood glue? which is solvent resistant. Would be a good trade item like powder paints for body decoration, going to a big singsing. Traditional weapon construction and use getting a modern help. I will poke the stuff about and get some pictures up latter. This link is very interesting. Could be an organic glue? The Mount Hagen peoples world changed rapidly but the traditional weapon and fighting methords would not change over night.
http://www.omnexus4adhesives.com/adh...als.aspx?id=49