What is the shelf life of 521 Marine Grade Epoxy Resin?

We recommend using our epoxy within one year of purchase. Epoxy should never be stored in direct sunlight and should nor kept in freezing temperatures. Storage in temperature above 90 degrees should also be avoided.
In order to prolong the use of epoxy in temperatures between 60 and 80 degrees in a dark cardboard box.
If months go by in-between uses we recommend shaking up the hardener bottle for about 45 seconds in case settling may have occurred. This is not necessary for the resin.