https://www.fangzhentape.com/product/duct-tape/ Adhesive performance should be evaluated on a surface that represents the actual use of the product. A tape may behave differently depending on whether it is applied to a smooth, rough, clean, painted, or otherwise treated surface. A practical receiving check can include: Initial adhesion Holding condition after application Ease of application Tape conformability Removal behavior when relevant The purpose is not simply to determine whether the tape feels sticky, but whether its adhesive behavior matches the agreed application requirement.