What technique is often used after the application of the fabric to ensure a tight finish?

The technique often used after the application of fabric in aircraft covering is heat treatment. This process involves applying heat to the fabric, which causes it to shrink and become taut over the structure of the aircraft. Achieving a tight finish is crucial in fabric covering, as it ensures that the fabric remains smooth and free from wrinkles or sagging, which can affect both the aerodynamics and overall appearance of the aircraft.

Heat treatment also aids in the adhesion of the fabric to the finishing materials, enhances the structural integrity, and can help in the curing process of any adhesives applied. This method not only ensures a snug fit but also helps in distributing stress evenly across the covered surface, contributing to the longevity and durability of the fabric covering.