These emulsions find applications in adhesives, paints, paper coating and textile coatings. The most advanced catheters have a thin hydrophilic surface coating. Other lenses need regular cleaning and disinfecting to prevent surface coating and infections. It is typically used for covering large surfaces with an even coating of liquid. Many were transparent film with a surface coating. The stacked particles make up a high wear resistant coating. Hydrogen is often introduced during manufacture from operations such as forming, coating, plating or cleaning. Methylene chloride and acetone are generally effective at removing powder coating. Acidic anodizing solutions produce pores in the anodized coating. The disc consists of a ferromagnetic material sealed beneath a plastic coating. The system works by placing the test head on the surface of the conformal coating. These systems provide a tough, protective coating with excellent hardness. The powder melts, flows, and then hardens to a smooth, durable vitreous coating. There is a wide variety of spray nozzles available for use in electrostatic coating. Galvanized metals have a very heavy zinc coating.