Kurt,
Have you considered using the old tried and true Weldwood Plastic Resin Glue? It's available from most lumber yards and hardware stores. Five dollars of it will go a long, long way.I've been using it for years and never had a failure. It's cheap and tough.
This is a powder to mix with water. I recommend mixing a consistency of heavy cream. For our panels we us it thick as peanut butter.
I'd suggest buying a couple of dollars worth, mix it up, and glue up a couple of boards. Throw them in a bucket of water and let stand for a week. I think you'll be pleased.
com
Joe Crumley
www.normansignco.