What is the primary purpose of finishing tape (surface tape)?

The primary purpose of finishing tape, also known as surface tape, is to provide additional wear resistance to the edges and seams of the aircraft fabric covering. By applying finishing tape over the edges of the fabric, it helps protect against abrasion and damage that can occur during normal operation, as well as from environmental factors. This added layer helps to preserve the integrity of the fabric underneath, thereby prolonging its lifespan and ensuring continued airworthiness of the aircraft.

While some tapes may have qualities that allow for color finishes, serve as a base for adhesives, or even provide insulation, these functions are secondary to the primary role of enhancing wear resistance in the fabric covering process. In the context of aircraft coverings, the durability of the fabric is crucial for safety and performance, which is why the use of finishing tape is emphasized.