UV printers have powerful printing capabilities. As long as they are flat and regular materials, they can basically print. The most common applications are tiles, glass, acrylic, soft film, leather, wood, etc. Some can be printed directly, but some are needed to use coating because of the surface smooth, direct printing ink has poor adhesion.
The coating is a volatile liquid with high transparency and relatively thin thickness. It can be applied on the surface of media of different materials without damaging and changing the properties of the media. The ink is printed on the surface of the coating of the media to better present the image effect . Common materials that need to be coated include tiles, glass, and metal. These materials have smooth surfaces, and it is difficult for ink to penetrate into the medium after printing. As a result, the adhesion cannot be expected. The pattern is easy to fall off and it is difficult to maintain it for a long time. 
In the usage of coatings, different materials are different. The corresponding coatings need to be used. The coating must be applied evenly. The thickness of the sprayed surface should not be too thick or too thin, and can be in a dust-free environment if possible. Used in the process, there must be no dust particles or water stains and impurities, and you need to wait for the coating to dry completely before printing, because it requires manual operation, the program is relatively cumbersome.
In order to solve this problem perfect,Skycolor has a new technology that can achieve coating on the machine, the coating is applied evenly, and the speed is fast, to avoid the related problems caused by manual coating, improve printing efficiency
More information:www.skycoloruv.com