<human>:  How do I refinish an old wooden chair?
<bot>: The first step to refinishing an old wooden chair is to sand it down. Use a medium to fine grain sandpaper to ensure that the surface is smooth and even. Next, you should apply a stain or varnish to the chair. To do so, use a brush or cloth to apply the product in even strokes, following the direction of the wood grain. After the stain or varnish has dried, you can use a wax or polyurethane to protect the surface and give it a glossy finish. Finally, use a soft cloth to buff the chair, giving it a beautiful and professional look.