UV printers have the capability to include a varnish in their CMYK line-up. Varnish is clear and shiny in appearance and jetted onto the product just as any other UV ink. When looking at a UV printer, be sure to let your industrial inkjet printer manufacturer that you want CMYK + W + V. Not all machines come standard with white and varnish.
What is also a misconception is that if you have varnish in your machine, you have to use. UV inkjet printers are advanced in that you can choose to use a varnish over your entire artwork or, just as a spot varnish.