How can I achieve a shiny finish on polyurethane surfaces?

To achieve a shiny finish on polyurethane surfaces, you can follow these steps:

1. Sand the surface with fine-grit sandpaper to smooth out any imperfections.
2. Clean the surface to remove any dust or debris.
3. Apply a coat of polyurethane using a high-quality brush or applicator.
4. Allow the polyurethane to dry completely before sanding lightly with fine-grit sandpaper.
5. Apply additional coats of polyurethane, sanding between each coat for a smooth finish.
6. Finish with a final coat of polyurethane and allow it to dry completely for a shiny finish.