Abstract not available for EP1112127 Abstract of corresponding document: WO0010737 A method of forming a barrier coating on a lead surface comprises treating the surface with an aqueous solution of a film forming ionomer having -COO<-> or -SO3<-> groups which is such that on drying the ionomer is converted to a water insoluble form, and drying said surface to form the coating thereon. The method is particularly useful for coating the inside surface of lead service pipes, e.g. water pipes.