I always store Sugru in the fridge, as recommended by the makers. I've had a few packages which I kept 1-2 years beyond the expiry date. Most of the time they will be too hard to use, once a pack had stayed soft but wouldn't harden when it was used. A couple of packs have still been usable.

The storage period of Sugru in the packaging before it hardens is not directly limited by an expiry date or a specific storage time. Sugru remains usable for a long time in its unopened packaging as long as it is stored in a dry place and protected from light.

- Sugru remains soft and mouldable in unopened packaging as long as it is not opened and exposed to air.
- After opening, you have 30 minutes to mould and apply Sugru before it starts to harden.

There is no specific information on a maximum storage time in the packaging, but it is important that Sugru is stored dry and protected to maintain its properties.