What is the primary purpose of a tie-in during the coating process?

The primary purpose of a tie-in during the coating process is to ensure continuity in surface finish. This technique is crucial for maintaining uniformity in the application of coatings, which can be essential for both functional and aesthetic reasons. Achieving a consistent surface finish helps to avoid visible differences that can affect the overall quality and appearance of the coating on the aircraft. Properly performed tie-ins ensure that the coatings remain seamlessly integrated, enhancing performance characteristics such as durability and protective functions, while also complying with the specific requirements for low observable (stealth) capabilities that are critical for certain military aircraft.

While factors like visual appeal and prevention of coating overlap can play roles in the overall coating process, they are secondary to the primary objective of maintaining a continuous and cohesive surface finish. Reducing material usage does not align with the intent of a tie-in, as the focus is on quality and consistency in application rather than minimizing material.