The cross-hatch test is a method used to evaluate the adhesion of paint or coatings to a substrate. It involves making a series of cuts in a grid pattern through the coating down to the substrate, followed by applying adhesive tape over the cuts. The tape is then pulled off to see how much of the coating remains attached. This test helps determine the quality of the bond between the coating and the surface, which is crucial for ensuring durability and performance. It is commonly used in industries such as automotive, construction, and manufacturing to assess the effectiveness of coatings.