Don't have Uni bond where I live. Is it a powder that needs water, or is it a resin and separate hardener?
The powdered only stuff might still be okay. If its a resin/hardener 2 part it would be past its use by date, even if kept in a fridge(not sure about a freezer though).
Whatever stuff you have, do a test with scraps before committing with valuable bow quality stock.
Love urea formaldehyde glues but they don't have a very long shelf life.