While UV-curable inks boast excellent adhesion properties, a primer still comes in useful when printing on particular substrates. Some substrates are notoriously difficult to make ink adhere too. Take for example metal, glass, ceramics or polypropylene, which can be used for numerous applications, including decorative printing, direct-to-shape printing, or marking & coding. To ensure superior bonding of UV-curable inkjet inks to challenging media, dedicated digital primers can save the day.