Shelf life of the Perming Agent is 12 months unopened. But air, light, temperature or moisture would affect the solution. DO NOT leave it under the heat or light (it affects the colou
r). The best way is to store it is in a cool, dark, dry place (DO NOT put it in the fridge). About 20 degree Celsius, 45~55% RH. Keep the nozzle clean and tight. When you open the product, please use it all as soon as possible.
You will require a longer time for thicker lashes. And please make sure to put the solution down low near the base.of the eyelash