This primer is used to clean & disinfect the real lashes. It will remove any dirt, oil & make-up on the natural lashes which prevent the extensions from adhering to the real lashes. Use immediately prior to your application process. Clients eyes should be closed when applying primer. It is no secret that the key to longer lasting lashes begins with a clean surface. Apply using 2 micro brushes (also sold in our store) to clean the lashes Shortens the application time.