What does a guide coat typically consist of?

A guide coat typically consists of a dark color sprayed on top of a primer-surfacer. The purpose of the guide coat is to help identify high and low spots on the surface during the sanding process. When sanding, the dark color allows the technician to see where material has been removed and where further sanding is necessary. It highlights imperfections or unevenness in the surface, ensuring that the final finish is smooth and even.

In contrast, other choices do not accurately reflect the function or composition of a guide coat. A clear solution would not provide the necessary contrast for identifying surface contours. A glossy finish applied before sanding would tend to create reflections that could hide imperfections rather than reveal them. A tinted paint for coverage does not specifically address the purpose of a guide coat, which is to serve as a visual aid during sanding rather than for coverage of the underlying color. Thus, using a dark guide coat is essential in achieving a well-prepared surface ready for the final finish.