Lashforever Canada’s Pro Lash Adhesive is a medical grade adhesive. Registered with Health Canada, hypoallergenic, 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. The best humidity setting is between 40-55% and store in a cool dry area.