Glue primer is transparent, supplemental product to maximize adhesion of the glue. If you use Glue primer, you can maintain extended eyelashes longer and prevent whitening effect before it occurs as glue becomes stiff. The procedure time is shortened if you slightly apply it before as only monomer component is left. It is so volatile that drying false lash separately is not needed. When using Glue primer, it is required keeping the Glue primer and a glue separate as it has stiffening effect to the glue once used side by side.