Primer

Application Before applying eyelash extension primer, wash away makeup with oil-free makeup remover or soap and water. Then, apply a small amount of primer onto 2 disposable microfiber brushes for eyelash extensions. Place one underneath lashes and one on top of lashes, and glide primer up to cleanse. Make sure lashes are completely dry before applying eyelash extensions. 

It’s Best For Dry climates and/or dry to normal natural lashes

What’s the difference between eyelash extension Primer and Pre-Treatment? The key difference between eyelash extension Primer and Pre-Treatment is the type of polyacrylate polymer used in each. The softer polymer in the Primer makes it great for drier climates. The super absorbent "waterlock" polymer in the Pre-Treatment, on the other hand, absorbs larger amounts of water to dry out the lash surface, and is ideal for oily lash types and humid climates.