When should fabric covering seams be sealed?

Fabric covering seams should be sealed immediately after stitching to ensure proper protection and integrity of the covering. This prompt sealing is crucial because it helps to prevent moisture and contaminants from infiltrating the seams, which could lead to deterioration of the fabric and the underlying structure over time.

By sealing the seams right after stitching, you create a barrier that enhances the durability of the fabric covering and maintains the aircraft's performance and safety characteristics. Delaying the sealing process until later stages, such as after painting or final coat application, may allow exposure to environmental conditions that could compromise the seam integrity before it is adequately protected. It is also not practical to wait until leaks are observed to address potential issues, as this reactionary approach does not prevent damage that may occur in the interim. Sealing right after stitching is a proactive best practice in aircraft fabric covering.