The food-grade paraffin wax application is essential in the production of waxed cardboard fish boxes as it ensures the freshness, durability, and hygiene of the box and its contents. It is vital to use high-quality waxes and ensure that the application process is done correctly to guarantee the best results. With its moisture-repelling, insulating, and protective properties, wax is an ideal coating material for fish boxes, improving their efficiency and ensuring that the fish reaches the market fresh and healthy.