Clear - Strong Hold Lash Bond LinerZERO GLUE. ZERO MAGNETS. ZERO DRY TIME. So, how does it work? Silk Strong Hold Lash Bond Liner uses Bidirectional Film Forming Technology to create the ultimate hold for false lashes. This film forming agent is known as a PSA (pressure sensitive adhesive). Pressure Sensitive Adhesives are a type of non reactive adhesive which form a bond when light pressure is applied with a surface. PSAs also display elastic properties which enable re sticking! This