This fast drying adhesive lasts up to 6-8 weeks, is sweat proof, water proof, and extremely durable. The viscosity is right in the middle of thick & thin - making it versatile with all types of lashes. This adhesive is not sensitive, but is lower in fumes than many others. And, it comes in jet black - helping give the illusion of a darker lash line. The humidity & temperature range for the ultra-hold adhesive are broad, working best between 35-65% humidity with temperatures between 67-73 degrees.