Who correctly identifies the applications of self-etch primer on bare metal?

Self-etch primers are designed specifically for use on bare metal surfaces. They work by applying a chemical etch to the metal, which helps promote adhesion for subsequent layers of paint. This type of primer is crucial in automotive refinishing because it provides a better bond than standard primers, ensuring durability and preventing peeling or flaking over time.

Technician B likely recognizes these essential properties of self-etch primer, understanding that it prepares the surface appropriately and offers corrosion protection. This makes it especially useful in automotive applications where exposure to moisture and varying environmental conditions can lead to rust and deterioration of the metal.

In contrast, it is essential to apply self-etch primers correctly to bare metal only. They should not be applied over previously painted surfaces or under other primers that could hinder their function. For these reasons, the accurate identification of self-etch primer applications reflects an understanding of best practices in autobody repair.