- The Muc-Off (SI) Ceramic coating is a highly advanced, durable, silicon infused protective layer that chemically bonds to your paintwork, producing a high-performance hydrophobic surface. This means maximum water and dirt\ shedding properties, along with UV protection. It gives the treated surface armour like protection against light surface scratches. It’s able to achieve this because the coating drastically reduces the surface tension, providing long term, year-round protection to your pride and joy, even in the harshest weather conditions.