We normally state that the resins will have a shelf life of 12 months. 

However in practice often they last much longer. If you have old resins, we recommend making a test mix to ensure it will still cure before you start on using it on a project.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

I still had a small amount of West systems 105 leftover from my very first purchase in 2005 ... I did a test with new hardener, and it worked perfectly after more than 7 years!!

My conclusion is, that the Resin will last for years, if kept cool, dry and dark.  The hardeners however will not last much more than a couple of years, even when ideally stored.

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