Does epoxy resin ever expire? Yes, of course all epoxy resin and hardeners have shelf lives

. ... The hardeners for epoxy resins are the more concerning (though still long-lived) materials. It is suggested that most hardeners are used within a year closed, or 6 months if opened.

What happens if you use old epoxy?

While WEST SYSTEM® epoxy has a long shelf life, age will eventually affect its handling characteristics and cured strength. When stored for very long periods, hardeners may turn darker (reddish to purple), become thicker and give off more odor. 105 Resin may lose some clarity and also become slightly thicker.

Can I use out of date epoxy?

ANSWER: Epoxy does have a shelf life and the physical properties will change over time. Epoxy manufacturers recommend you do not use epoxy that has reached its expiration date.