What is the role of a sealer in aircraft fabric covering?

The role of a sealer in aircraft fabric covering is fundamentally to provide additional protection against moisture. Waterproofing is crucial in aircraft maintenance and safety, as moisture can weaken the fabric and lead to deterioration or unexpected failure. By sealing the fabric, the sealer creates a barrier that prevents water ingress, thus maintaining the integrity and durability of the covering over time.

Additionally, while sealers can sometimes contribute to other functions such as enhancing appearance or reinforcing the fabric to some extent, their primary and most critical function remains focused on moisture protection. This is particularly vital for aircraft that may operate in varied environmental conditions, ensuring that the fabric covering remains intact and performing well.