my paste the ones I got state a short shelve life read what brand you intend to use has to say on that 2 to 4 months after its been opened cause once its exposed to air it may start to cure [ I e-mailed artic on this to see what they say]
I guess its best to find out from brand to brand like I said its just a e-mail to them to see what they say [ I don't buy bulk anyway just the small tube to do the job at hand that way I always know its fresh unopened ]... opinion