Lashforever Canada’s Pro lash glue is a medical grade adhesive. Registered with Health Canada, hypo allergenic, waterproof, designed for quicker applications, dries within 1-2 seconds with low to no fumes. This glue has a life span of 6 months unopened and 6-8 weeks once opened, will wear up to 3-4 weeks. Best humidity setting is between 40-55% and store in cool dry area.