How effective is thinning water-based polyurethane for achieving a smoother finish on wood surfaces?

Thinning water-based polyurethane can be effective for achieving a smoother finish on wood surfaces. By adding a small amount of water to the polyurethane, it can help the product spread more evenly and reduce brush marks. However, it is important to follow the manufacturer's instructions and test the thinned polyurethane on a small area before applying it to the entire surface.