What is varnish in printing?

The distinction people most often ask about is varnish versus lamination, and it is largely a question of how much protection you are buying. A varnish is a thin liquid film applied and dried on press. A laminate is a physical plastic sheet bonded to the paper. Lamination is thicker, tougher, more water-resistant and more expensive; varnish is cheaper, thinner, and adds no meaningful strength.

Matte varnish and matte lamination are also frequently confused. Matte varnish gives a subtle reduction in sheen and modest protection. Matte lamination gives a deep, flat, tactile surface and substantial durability. They look and feel quite different in the hand, and specifying one when you meant the other is a common and disappointing mistake.

The most common use of varnish is invisible and functional: a flood of sealer over heavy ink coverage so the sheets can be stacked and handled without setting off onto each other. Nobody notices it, and its absence is very obvious.

One planning point carries across all of these. Neither varnish nor lamination should cover a glue area, because adhesive will not key to a coated surface. Which areas stay uncoated is decided from the dieline, so the finishing has to be specified while the structure is still being drawn.