What does Technician B advocate regarding the use of putty knives in applying body filler?

Technician B’s advocacy for using a separate knife for each step in applying body filler is rooted in the importance of achieving a smooth and even finish while minimizing contamination of the filler. Each stage of the body repair process may involve different types of fillers or putties, and using a dedicated knife for each ensures that the materials do not mix, which can affect adhesion, cure times, and the overall finish quality. This approach also helps maintain the integrity of the tools, as mixed materials can become hard and difficult to clean off, potentially damaging the knife being used. Therefore, employing a separate putty knife for each phase promotes better results and contributes to a more professional repair outcome.