How long can most two-part epoxies be stored?

• A. 2 years
• B. 5 years
• C. 10 years
• D. 20 years

Answer: (C)

Shelf life for unopened two-part epoxy systems depends on keeping the resin and hardener in their original containers, tightly sealed, and stored in a cool, dry place away from direct sunlight. Under those ideal conditions, many epoxy products can remain usable for about ten years. This reflects the longer end of what manufacturers typically guarantee for unopened packages. Shorter timeframes like a couple of years or five years occur if storage isn’t optimal, while twenty years is beyond what is usually guaranteed. Always check the manufacturer’s stated shelf life on the container. Remember, once the components are mixed, the usable time (pot life) is much shorter, often hours to a day.