What is one of the functions of an undercoat?

An undercoat plays an essential role in the painting process by providing a uniform surface for the application of a topcoat. This is crucial because an even surface ensures that the topcoat adheres properly and displays consistent color and finish. If the undercoat is uneven or poorly applied, it can lead to issues such as uneven gloss, variations in color, or poor adhesion, ultimately compromising the overall quality of the final finish.

While undercoats may offer some benefits in terms of moisture protection or aesthetic enhancement, their primary function is to create that smooth, even foundation that allows the topcoat to perform optimally. This uniformity not only aids in the visual appearance of the paint job but also contributes to the durability and longevity of the finish.