What is the primary reason for using layout tape when marking fastener locations?

Using layout tape to mark fastener locations is primarily beneficial for preventing damage to the assembly. This type of tape is designed to be less aggressive than other marking methods, such as permanent markers or paint, which can cause permanent alterations to the surface of components. By applying layout tape, mechanics can create precise markings without the risk of scratching, gouging, or otherwise damaging the materials involved in the assembly process. The gentle adhesion of layout tape allows for easy application and avoids any long-term impact on the integrity or appearance of the assembly, making it suitable for detailed work where precision is key.

While enhancing visibility is an advantage of using layout tape, it is not its primary purpose. The tape's design and placement inherently improve the visibility of measurements and markings, but the main goal is to maintain the integrity of the assembly. Similarly, while ease of removal and indicating measurement units are beneficial aspects, they are secondary to the critical need to prevent damage during the assembly process.