How long can an opened bottle of enamel or topcoat last?
Approximately 1 to 1.5 years, with proper storage.
2.
How should I store the enamel or topcoat?
All enamel and topcoats should be kept tightly sealed, in cool and dry places, away from direct sunlight. When performing nail art, transfer some color to an external palette, and seal the remaining color in the bottle tightly.
Note: Do not allow opened bottles to be exposed to the atmosphere for 3 minutes or more, as the loss of moisture will significantly
reduce the product life.
3.
How would i know when the enamel / topcoat is no longer suitable for use?
It will become thick and clumpy, and does not apply on smoothly over the nails.