What must be done to the finishing tape before applying it to the fabric?

Pre-shrinking the finishing tape is an essential step before applying it to the fabric because it ensures that the tape will not shrink after being applied. If the tape shrinks post-application, it could pull on the fabric and lead to potential damage, misalignment, or wrinkles in the covering. Pre-shrinking the tape allows for a proper fit and secures the integrity of the overall fabric covering process.

When the tape is pre-shrunk, it effectively minimizes the risk of distortion that could occur during changes in temperature or humidity after installation. This process contributes to the longevity and durability of the aircraft's fabric covering, enhancing its overall performance and appearance.

In contrast, the other options do not address key aspects of preparing the tape for application in the same crucial way that pre-shrinking does. The specific focus on minimizing risk factors associated with fabric covering makes pre-shrinking the correct and necessary requirement.