The production process of spray painting advertising signs: The indoor materials for spray painting include lamp sheets, photo paper, instant stickers, etc. Outdoor materials are divided into backlit fabric, front-lit fabric, instant stickers, etc. Lamp sheets and backlit fabric are often used to make light boxes, while photo paper is suitable for making advertising posters, posters, and wall hangings. As the name suggests, front-lit fabric means the light is projected in front of the image; outdoor large advertisements and road signs are mostly made of this material. Instant stickers can also be called adhesive-backed photo paper, which conveniently allows spray-painted images to be mounted on other materials. Indoor instant stickers are mostly used for making display boards, while outdoor instant stickers are often used for vehicle wraps and similar applications.