Wipe down the surface of the sanded wood with a tack cloth. This will help to take off all the dust that sanding helps to accumulate.
Run a handheld vacuum over the surface area of the wood. This will help to remove any residual dust.
Add a silver dollar-sized amount of wood conditioner to a lint-free cloth. Distribute the wood conditioner evenly around the sanded wood. Buff it in uniformly with a cloth. Allow the conditioner to penetrate the wood for at least 20 minutes.
Apply the paint or stain of your choice using a 3-inch-wide nylon brush. If using stain, allow the stain to penetrate the wood for at least 20 minutes before wiping and reapplying a second coat. If painting, apply two coats of paint, allowing 12 hours of drying time between each coat.
Cover the wood with a clear coat of polyurethane finish to protect the wood. Apply it with a 3-inch-wide nylon brush.