Softwood PSE Boards V Redwood 25 x 50mm is a Planed Square Edge timber that can be used for furniture and internal joinery applications where a smooth finish is required. The timber has been machined to create square corners making it ideal for use with internal joinery work. The standard grade PSE has been machined from “fifths” redwood which features fewer knots. PSE Boards can be used with nails and screws and once applied can be glued, stained, varnished and painted.