UV coating liquid is a type of adhesive that allows your UV ink to adhere to special materials such as PP, ceramic, glass, metal, and others. In simple terms, because the surfaces of these materials are relatively smooth, you need to apply a layer of UV coating liquid on the product surface before printing. Then, the UV ink adheres to the surface of the UV coating liquid, and through curing with the UV lamp, the two fuse together. This allows the printed pattern to adhere better to the product surface. So its main function is to improve adhesion.
Another function is to optimize the appearance of the printed pattern. It prevents the ink from shrinking at the edges, makes colors more vibrant, the pattern more detailed, and enhances the overall texture.