Wetwop™ is a pre-mixed liquid that is applied to the adhesive side of tape with a camelhair brush. It can be used to develop prints on any adhesive surface, such as masking, duct, clear, cellophane, brown packaging and nylon reinforced strapping tapes. Wetwop™ produces excellent friction ridge detail results and has an indefinite shelf-life. No mixing is required when using Wetwop™.