? extra strong evolution – is an advanced version of stacy lash extra strong eyelash extension glue featuring higher retention (up to 8 weeks in the manufacturer’s laboratory).This glue is designed solely for professional use by certified lash extension technicians. ? fast dry time — 1-2 seconds. This eyelash adhesive has been designed for highly skilled lash artists, with fast dry time adding to speed of eyelash extension procedures. It works well in high humidity (rh 50-70%) at 70-74f (21-23c). ? lower fumes and less irritation – new formula features lower level of fumes and chances of irritation, while retaining short drying time, having same flexibility and improved retention.