Products in powdered form should be stored in the refrigerator, far from the door, far from the freezing tray. We strongly recommend you place your gear in their own container, along with desiccant packs. Under ideal storage conditions powdered products can last years.
Once reconstituted, (or seal broken, in the case of pens) the same storage guidelines apply; however, the product should be used within 28–30 days.
Oil-based products on the other hand, should be stored in a cool, dark place.