Yes, the patch test is mandatory for all new customers and any new adhesives you use on the site for the first time. The patch test should be performed 24 hours before eyelash extensions. Apply 5 shorter extensions around the lashes to each eye and leave them on after 24 hours. If no allergic reaction appears during this time, then the glue can be used for the entire set without any worries. However, you should know that even this test is not 100%, as a reaction can still occur with a larger amount of glue.