Does stained glass grinder coolant go bad in the bootle?

Yes, stained glass grinder coolant can go bad in the bottle over time. If left unused for an extended period, it may separate, lose its effectiveness, or develop an unpleasant odor. It's advisable to check the coolant for any changes in consistency or smell before use and to store it in a cool, dark place to prolong its shelf life. Regularly replacing old coolant is a good practice to ensure optimal grinding performance.