While installing gaskets, Technician A believes gaskets alone will produce a leak-proof connection between parts. Technician B believes that some gaskets require sealer to prevent leakage, especially where gaskets overlap. Who is right?

Technician B is correct because certain gaskets, particularly those that operate in high-stress environments or where they overlap, require the application of a sealer to ensure a leak-proof connection. While gaskets are designed to provide a seal between components, their effectiveness can be compromised by various factors such as high temperatures, pressure changes, or the materials of the components being sealed.

In situations where gaskets do overlap, a sealer helps fill any small gaps or imperfections that could lead to leaks. Additionally, it can provide extra adhesion, preventing the gasket from shifting during operation. Therefore, using a sealer in conjunction with gaskets is often necessary to achieve a reliable and durable seal, particularly in demanding operational conditions such as those found in school bus body systems.