What is the purpose of a primer in painting?

The purpose of a primer in painting is to serve as the first full coat applied to a surface. Primers are specifically formulated to adhere to the substrate and create a suitable surface for subsequent layers of paint. They play a crucial role in promoting adhesion, blocking stains, and sealing porous surfaces, which ultimately enhances the durability and appearance of the final paint application.

Using a primer ensures that the topcoats adhere well, providing an even finish and lasting protection. This initial layer is fundamental in preparing the surface for the color coats that follow, setting the stage for a successful painting project.