BL Black Diamond Coating Sealant was developed to protect the eyelash extensions while providing a thicker, deeper-black luscious look for the lashes. Applied daily it protects the eyelashes from moisture and unwanted pollutants, which can attribute to the bond breaking down of the adhesive. It coats the lashes with a black tinted sealant similar to mascara, which extends the life of the Lash lift ,Black tint ,eyelash extensions.