Senselashes Speed Booster is one of the BEST eyelash products on the market and absolute must-have in every professional lash extension kit!  What are the key benefits of using a lash primer? Natural lashes can be smooth and silky, which can result in extensions ‘sliding off’. Due to it’s Alkaline qualities, Retention and Speed Booster gently opens the hair cuticles without damaging the natural lashes, enabling the glue to grab on the cuticles and hold better, improving your retention.  When the Retention and Speed Booster is applied, natural lashes become “magnetic”. You don't need to hold the extension above the natural lash for a while to make it “grip” - so your treatment time improves significantly.  If Retention and Speed Booster is applied on the base of the extensions strip, it helps to stop glue running up the fiber and closing the lash fans, making Russian Volume lash application faster and easier. How to use: To increase the retention, apply Retention & Speed Booster with a micro brush on natural lashes, after cleanser and primer to slightly open hair cuticles and increase the surface for better grip and adhesion. To increase the speed of the treatment, apply Retention & Speed Booster with a micro brush on the strip of the extensions in the box or on the lash palette to prevent the lash fan from closing during the "fanning". IMPORTANT! Do not use on Easy Fanning lashes! Easy Fanning Lashes are made by connecting multiple layers of lashes with a very fine non-cyanoacrylate adhesive. Booster can melt this adhesive, making Easy Fanning lashes difficult to apply.