When is finishing tape applied on a fabric-covered aircraft?

The application of finishing tape is a crucial step in the fabric covering process for an aircraft. It is specifically applied after the primary fabric doping has been completed but before any sealer coats are applied.

This timing is essential because finishing tape serves to strengthen the seams and provide a smooth surface for the subsequent coatings. By applying it after the initial doping, the tape adheres properly to the fabric, allowing the chemical properties of the dopes to bond effectively. If applied too early, before the primary doping, the tape may not adhere correctly, affecting the overall integrity of the fabric covering. Conversely, if it were applied after all coatings, it would not be able to bond properly, which could lead to issues such as peeling or inadequate sealing of seams.

In summary, finishing tape ensures that the seams are well-protected and integral to the aircraft's performance, which is why its precise timing in the application process is vital.