CA by its very nature is an unstable brew. There are numerous types of CA but I believe the instability of most is accelerated by high humidity, heat and UV light. I don't know if there is a stability threshold or if it is a gradual process. One manufacturer claims to store under 90'F. Best bet would be to store in a cool, dark and dry place. Keep bottles sealed when not in use. Try to limit the use of accelerators (accelerators weaken the bond.) Becasue it is unstable, CA has a very short shelf life. Anything over 12 months old is probably bad. Always use fresh glue.