zor. I've never done viscosity tests on my wood glue. If I feel that it's too thin, I take off the cap and stir up the bottles contents, using a length of music wire..That usually brings up the viscosity to usable levels.
When I buy glue, I pick businesses that sell it in vast quantities. That way, I'm assured of getting the freshest product available.
I've seen CA in hardware stores that is so old that it doesn't flow in the bottle. I've seen wood glue in hobby shops that is settled out, and thin on the top.