Are you de-oiling the Osage??? Wipe it down good with Acetone ( I prefer this) or Lye....Oven Cleaner will work too.....and let it dry....and then Glue them down with Titebond....I like Hide Glue myself the Best....you can glue two pieces of Glass togethe with Hide Glue....and it will break the Glass first before the Glue lets go....and than I seal it with polyurethane