Pro adhesive is a super fast drying glue great for classic or volume eyelash extensions. With its super fast dry time it is recommended for experienced lash artists. Pro Adhesive should be changed about every 15-25 minutes on a jade stone for best results. 1 second dry time, 6 week hold! For best hold use at 25%-40% humidity. Adhesive performs best at 68-75°F. This glue is black in color. The lower the humidity, the slower the dry time.