When you see shiny wood, it's likely that the wood's shine is caused by a coat of polyurethane on it. You can take virtually any piece of wood and add a DIY shiny wood finish using polyurethane. The process is not difficult but it is time consuming and takes a lot of hard work to get a smooth, flat, shiny finish. Since the process is not overly complicated, it is a great place to start learning about woodworking.
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Sand the surface of the wood with 600-grit sand paper to remove any imperfections and to give the polyurethane a gripping surface. You can sand freehand or you can use an electric sander like an orbital sander or a belt sander if the project is large. If you use electric equipment, be cautious: An electric sander can remove a lot of wood very quickly.
Wipe the surface clean with a rag dampened with mineral spirits. This removes all of the wood dust from the wood pores.
Brush clear pore filler onto the wood surface with a paint sponge. Pore filler is essentially thick polyurethane designed to fill up the pores in wood. Allow the pore filler adequate time to completely dry before moving on. This timeframe depends on many factors. For example, the humidity, temperature and brand of filler all affect drying times. Follow the drying times on the container.
Sand the surface of the pore filler with 600-grit sand paper. As you sand the filler you will remove it from the wood surface and you will leave the filler inside the pores. Duplicate Steps 3 and 4 until the surface of the wood is smooth and you can no longer see the pores in the wood surface.
Wipe the surface of the wood with mineral spirits and allow the chemicals time to dry before moving on.
Paint a coat of polyurethane onto the wood surface. Again, allow adequate drying time before sanding with 600-grit sand paper. Complete a light "scuff" sanding just to give the next coat an adhering surface. Complete three coats of polyurethane.
Sand the surface of the polyurethane flat with 600-grit sandpaper. Graduate the sandpaper from 600-grit to 800-grit, then move to 1000-grit and then to 1200-grit sandpaper. As you graduate to finer grits of sandpaper you remove scratches from the surface of the polyurethane. Be careful not to sand through the hard-coat and into the wood surface. If you do, apply an additional three coats of polyurethane and start this step over.
Apply a buffing compound to a cotton rag and buff the surface of the wood with the rag. This will apply the shine to the wood surface.