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30 days return guaranteeFor bonding to ceramic crowns. Reliance Porc-Etch and Porcelain Conditioner are intended for use in the preparation of glazed dental porcelain for bonding. Porc-Etch will prepare porcelain surfaces for the application of Porcelain Conditioner. Porcelain Conditioner is a silane coupling agent which chemically bonds to the silica in porcelain and the acrylic in chemical, light-cure and dual-cure adhesives.