Which of the following functions does an electro deposition primer serve?

An electro deposition primer plays a crucial role in the painting process by creating a strong bonding layer for paint. This function is vital because it ensures that subsequent paint layers adhere well to the surface, enhancing the durability and longevity of the overall paint system. Electro deposition, also known as e-coating, uses electrical current to deposit the primer onto metal surfaces uniformly, including hard-to-reach areas. This method not only helps in achieving a consistent layer but also improves corrosion resistance, further supporting the integrity of painted surfaces. A well-bonded application means the paint is less likely to chip or peel, contributing to the quality and finish of the final product.

While other options like adding durability or rust prevention are relevant to the performance of coatings in general, they do not specifically define the primary function of an electro deposition primer as effectively as its role in creating a bonding layer for paint.