There are many products used when carrying out a full set of lash extensions, therefore imperative that patch tests are carried out on all potential new clients 24-48 hours before their lash appointment with you. The best time to perform a patch test is when the client is making the appointment.
Insurance Companies will differ in their advice
There are many insurers, and all of them will offer different advice. It is best to check with your own insurance company, and find out what they require in regards to patch testing your lash products.