UV coating is basically a compound that is applied to paper wet and then instantly dried by ultraviolet light. Several different types of compounds are used to coat paper, including polyethylene, calcium carbonate and kaolinite.These compounds are refined and mixed with viscosifiers that help theme adhere to paper. UV coatings can vary in reflectively and thickness, depending on the application, though a high gloss or ssubtle matte are typically used in premium printing applications.