What is one primary purpose of primer in the painting process?

In the painting process, primer serves a crucial role in creating an adhesive surface for the top coat. This is important because a properly applied primer allows the top coat of paint to bond effectively with the substrate beneath it, ensuring good adhesion and durability of the paint finish. Without a suitable primer, the top coat may not adhere well, which can lead to peeling, chipping, or fading over time.

Additionally, primer can help to seal the surface being painted, which can prevent issues such as bleeding of the substrate (for instance, when painting over wood or certain metal surfaces). This sealing effect also enhances the overall appearance of the finished job by creating a uniform base color and texture, which can further benefit the application of the top coat.

While other options mentioned elements related to the painting process, such as adding a gloss finish or enhancing color vibrancy, these functions are not the primary purpose of primer. The main focus remains on its ability to create an effective platform for the subsequent layers of paint.