Bisco's Bis-Silane is a two-part silane coupling agent in an alcohol base that is used to improve bonding between porcelain and resin. Silane coupling agents are known to enhance the wettability of composite resins to glass substrates, increase physical, mechanical and chemical bonding of resin to the porcelain, and yield greater resistance to water attack at the bonding interface. The two-part formula offers long lasting effective bonding to porcelain.