Porcelain Etch, Silane Refill Kit, 9.5% Hydrofluoric Acid, Silane Liquid Refill, 1.2 ml, Colourless, 4/Pk, 502505About this product Viscous solution Rinses clean away Includes adjustable Spira Flo brush tips with curved cannula for optimal entry Silane solution used after etchant enhances the bonding of resin material Viscous 9. 5% Hydrofluoric Acid Solution. For porcelain veneers and inlays prior to cementation or repairs. It conveniently rinses away with water without leaving any residue. Kit includes (4) 1. 2mL Prefilled Silane Syringes.