Screen printing is one of the most widely used techniques, allowing printing of up to six spot colors depending on the product and providing long-lasting and reliable results. This technique is applied to smooth surfaces, achieving high-resolution images. Screen printing involves transferring the design to a screen (polyester or nylon mesh) coated with a photosensitive layer that reacts with ultraviolet light. This light hardens the areas not to be printed, allowing the design to bleed through. This technique is often used on textiles, plastics, wood, or aluminum items such as T-shirts, bags, jerry cans, notepads, backpacks, and caps.