What is one of the main roles of the sealer coats on fabric aircraft?

The primary purpose of sealer coats on fabric aircraft is to provide water resistance. The sealer coats create a protective barrier that prevents moisture from penetrating the fabric and reaching the underlying structure of the aircraft. This is critical because moisture can lead to degradation of the fabric and potential deterioration of the aircraft's integrity over time. By ensuring that the fabric is waterproof, sealer coats help maintain the durability and longevity of the fabric covering, safeguarding the aircraft from environmental elements that could compromise its performance and safety.

While there are other benefits to the application of sealer coats, such as preparation for painting, the water resistance is fundamental to protecting the fabric and maintaining the overall health of the aircraft structure. This protective role is especially important in aviation, where exposure to various weather conditions is common.