What is UV?  UV coating an extremely high gloss coating that provides a moisture, curl and fade resistant finish. We only use UV coating on postcards, rack card, door hanger, brochure and tabloid over 5,000 of the same design.   Note: UV cards cannot be used with inkjet printers, laser printers, and postage meters.  If you are using a mailing service, check if the UV coated paper is acceptable.  Most mailing services cannot print on this coating.