How can I effectively apply gel stain over polyurethane to achieve a smooth and durable finish on my project?

To effectively apply gel stain over polyurethane for a smooth and durable finish, follow these steps:

1. Lightly sand the polyurethane surface to create a rough texture for the gel stain to adhere to.
2. Clean the surface to remove any dust or debris.
3. Apply a thin layer of gel stain using a brush or cloth, following the wood grain.
4. Allow the gel stain to dry completely before applying additional coats, if needed.
5. Seal the stained surface with a clear polyurethane topcoat for added durability and protection.