A 15 ML Eyelash Extensions Glue Primer is a product used in the application of eyelash extensions to prepare the natural lashes for a better bond with the adhesive. The primer helps to cleanse and dehydrate the natural lashes, removing oils, makeup, and other residues that could interfere with the adhesive bond. This is an essential part of the eyelash extension process, as it helps to ensure a strong and lasting bond between the extensions and the natural lashes. 15 ML Eyelash Extensions Glue Primer is typically applied to the natural lashes using a micro brush or applicator.