What is typically used between the fabric and rib stitching to ensure proper adherence?

Reinforcing tape is crucial in the process of securing fabric to the ribs of an aircraft's structure. This tape provides a stable base for the stitching and helps distribute stress over a larger area, thereby preventing fabric tearing and ensuring that the seams remain intact during operation. By enhancing the structural integrity of the connection between the fabric and ribs, reinforcing tape plays a vital role in maintaining the aircraft's overall performance and safety.

Other materials mentioned, like adhesive spray or sealant, may have specific applications in aircraft maintenance or construction, but they do not serve the primary function of enhancing adherence between the fabric and rib stitching as effectively as reinforcing tape. Grommets also do not contribute to the adherence but are used for creating openings in the fabric for various purposes, such as attaching control surfaces or for ventilation.