What Is Hot Foil Stamping? Hot foil stamping is the process of using pressure & heat to apply metallic foil to various kinds of containers for decoration and product labeling. It works on cardboard, paper, corrugated board, glass, plastic sheets, and many other types of materials. Hot foil stamping on the glass is widely used in the printing industry for their varied uses and high-quality printing. When the stamp designs are customized as per the requirement of the product or brand and are placed on the product through the hot foil stamping method that is termed as Custom hot foil stamping.