Q1: What is the primary purpose of applying a varnish before printing (pre-print), compared to a post-print finish?
A: The core purpose is substrate preparation. By sealing the surface, it creates a controlled, non-porous base that prevents ink absorption, ensuring optimal ink holdout on the surface. This directly enhances print sharpness, color vibrancy, and gloss, while a post-print finish is primarily for top-layer protection and aesthetic enhancement.

Q2: What are the key operational benefits for the printing process when using a pre-print varnish?
A: Key benefits include reduced ink consumption due to less absorption, faster ink setting and drying times, improved print consistency and dot fidelity across the sheet, and minimized risk of picking. This leads to greater overall production efficiency, higher print quality, and reduced waste.

Q3: On which types of substrates is pre-print varnish most recommended or necessary?
A: It is highly recommended on uncoated, porous, or uneven substrates (e.g., recycled board, certain kraft papers, or uncoated label stocks) where ink absorption and dot gain are significant concerns. It can also be beneficial on coated stocks for achieving the highest possible print quality and color saturation in premium work.