PROFESSIONAL EYELASH EXTENSION GLUE FOR QUALIFIED LASH TECHNICIANS ONLY Experience Level Advanced Strength  Extremely Strong  Drying time 0.5 second Room humidity 50-65% Room temperature 18-25°C (64.4°F - 77°F)  Viscosity  thin, medium, syrup like Thin If you're on the hunt for a long-lasting adhesive with an exceptional dry time, then you can look no further. Ultra Bond lash adhesive / lash glue: Our best selling adhesive  Suitable for classic lashes as well as russian lashes. Extremely fast-drying (0.5 sec) Retention: 6-8 Weeks/opened, 8 Months/unopened Oil proof and water proof HOW TO USE:     Shaken side to side NOT up and down     Shake before each use     Shake for 20 seconds to ensure ingredients are well mixed     If the glue is not well shaken will result in retention issues     Changed every 20-30 minutes and a new drop dispensed into a new glue ring or on a new area on a jade stone or crystal stone     Never dispense adhesive on top of the previous drop