Pine plywood comes in large sheets and is often used in roofing and subfloor construction. The plywood gets its strength from multiple layers of pine veneer, each layer positioned at a right angle to the previous layer and tightly laminated to form a solid sheet. Pine contains a high level of resin, which can cause uneven wood stain absorption if a sealer is not used.
Wear splash-proof goggles and work in a well-ventilated area. Drape the floor with a plastic drop cloth.
Apply pine sealer with a paintbrush to the surface of the plywood. Brush on evenly, as directed on the container, and let the pine sealer soak into the plywood and dry.
Sand the face of the plywood. For a fine finish, such as a cabinet base, use a 220-grit sanding block and sand in the direction of the wood grain.
Brush on wood stain in the direction of the wood grain and wipe off quickly. Plywood can absorb wood stain faster than solid pine, so wipe off the first application promptly. If you want a deeper color, you can always apply more stain.