Which of the following best describes the function of a high solid content in primer-surfacer formulations?

The function of a high solid content in primer-surfacer formulations primarily serves to build the surface and enhance adhesion. Primers are designed to create a stable foundation for subsequent layers of paint. When a primer contains a high proportion of solids, it helps to create a thicker, more substantial coating. This thickness allows for better filling of minor imperfections and defects in the substrate, resulting in a smoother surface for the topcoat to adhere to.

In terms of adhesion, a well-formulated high solid content primer-surfacer can significantly improve the bond between the substrate and the topcoat, ensuring that the finish is durable and long-lasting. This is crucial in automotive refinishing where the quality of the finish directly impacts both aesthetics and performance. The other options, while they may relate to painting processes in different ways, do not accurately describe the primary benefit of high solid content in primer-surfacer formulations.