Dipwell powders should last up to two years if stored in a cool, dry place and kept out of direct sunlight. The lifespan of glow-in-the-dark powders is likely to be shortened if you pre-charge the entire pot in sunlight before application.
The liquid components have a shorter shelf life and are more sensitive - they will last up to a year with proper storage and if care is taken to keep the product off the neck of the bottle and to clean the brush thoroughly after each use.