A continuous and flexible method and apparatus is provided for applying one or more coating materials to internal and/or external portions of a fiber batt to provide edge and surface coating layers on those surfaces of the fiber batt that will be exposed during subsequent use. The invention provides for the coating to be applied selectively all exposed surfaces of a fiber batt and provided internally within the fiber batt for later splitting into opposing edges, thereby improving both the manufacturing process and the consistency and flexibility of the resulting product by reducing or eliminating the need for subsequent manual coating of unfinished edge surfaces.