Dupont car film has watermark. Authentic DuPont logo is DOPOINT, with DuPont watermark on the film and digital number on the watermark. Watermark mainly refers to signs, information, websites, images, sound and video signals left on modern digital photos. Dupont is a brand of American car film. Dupont's main products in China are high-strength thermal insulation and explosion-proof films, which are commonly called DuPont explosion-proof films. It adopts advanced magnetron sputtering technology, plating advanced aerospace hollow metal nano-materials such as gold, silver, aluminum, titanium, nickel, etc. on high-performance polyester film with strong tension, plus a solid and wear-resistant scratch-resistant coating.