Before applying a finish to manufactured boards, what must first be applied?

Before applying a finish to manufactured boards, a primer must first be applied to create a suitable surface for further treatment. Primers are specifically designed to adhere to the board and provide a stable foundation for additional finishes, such as paint or varnish. This initial layer helps to improve the adhesion of the topcoat, ensures an even application, and may also enhance the durability of the finish against moisture and wear.

Using a primer also serves to block stains and prevents the underlying material from affecting the appearance of the final coat. Additionally, it can provide a surface that is more receptive to the finish, leading to a more uniform and visually appealing result. While sealants and paints are essential components of the finishing process, they typically follow the application of a primer in the sequence of finishing manufactured boards.