FWIW I've never had to throw away PVA in nearly 40 years or using it unless the cap wasn't airtight and it dried out.Lons":uz3h8lcn said:I've bought loads of different brands of PVA over the years, I'm not using it every day, sometimes weeks between and they all seem to go off.
The oldest bottle of PVA I currently own is 19 or 20 years old and it's still usable. It's nothing fancy, just a basic white craft glue.