There are two different points being discussed, first is quality management, and the other is spoiling. Quality management is a system of defined factors that an entity adheres to, and is why you rotate stock based on date. Spoiling is obvious, but it may be slow and performance degrades over time. The two may or may not relate to each other in a meaningful way. My view for the home shop is if the Loctite still flows like gel, it'll do fine. Runny with chunks gets thrown away. How long does it take to expire once it's cured on threads?