4x1.2ML Syringes + 8 tips Benco Porcelain Etch is a professional etching gel containing 9.6% hydrofluoric acid for etching porcelain veneers and inlays. Porcelain gel will not stain resins or resin cements, which also makes it ideal for use in etching fractured porcelain surfaces prior to cementation or bonding with resins and resin cements. It may also be used to etch hybrid composites.