Manufacturers of wood and cement-board trim, siding and other construction materials find it beneficial to prefinish their boards prior to installation. This provides more consistent, uniform coating results and is mandated by the paint manufacturers in order to offer an extended warranty.
Prefinishing consists of applying a paint or primer at the factory rather than after installation at the construction site. Prefinishing requires a wood drying system, consisting of a coater, conveying equipment and a drying oven. The wood drying system can process large panels of wood or cement board, up to 4 by 8 feet, or long boards up to 8 inches wide and 24 feet long.