Hi Jeff,
First thing I would try is heating a small sample gently to see if driving off some of the moisture helps to thicken the resin into something sticky like treacle. If it does, I would test it with two pieces of wood and see if it binds flat surfaces together. Then try with irregular surfaces of wood. Then with wood and a piece of scrap metal. Try not to get too many bubbles in it when it thickens.
This is what I have seen Filipinos do with tree resins. As far as any additives to improve the bonding, I have no idea.
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