What is a substrate in relation to paint or varnish?

A substrate in relation to paint or varnish refers specifically to the surface onto which the paint is applied. This is crucial in painting and finishing processes because the characteristics of the substrate—such as texture, porosity, and color—can significantly affect not only the adhesion of the paint or varnish but also the final appearance and performance of the coating.

For example, different substrates like wood, metal, or drywall each require specific preparation and types of paint or primer to ensure optimal adhesion and durability. Understanding the nature of the substrate allows for proper selection of materials and techniques, leading to a superior finish. This concept is essential for anyone involved in painting or finishing work, as it directly influences the success of the project.