True or False: When cap sealing, sealant should be used until the contour of the fastener is no longer obvious.

Using sealant until the contour of the fastener is no longer obvious is a guideline in ensuring that a proper seal is achieved. This practice helps to prevent leaks and protect against environmental factors that could cause corrosion or degradation of both the fastener and the assembly. A sealant creates a barrier that fills gaps and surface irregularities, which is especially important in aerospace applications where maintaining pressure and preventing contamination are critical.

In many cases, complete coverage helps ensure that any potential pathways for moisture or contaminants are sealed off, thereby enhancing the longevity and reliability of the assembly. Various standards and practices may specify this approach to ensure the effectiveness of the sealant in preventing failures that could potentially compromise the safety and performance of the aircraft.

While some situations may vary based on the specific type of fastener or assembly requirements, the general principle remains that sufficient sealant provides an overall protective measure, aligning with best practices in the aerospace industry.