What are the best application techniques for achieving a flawless finish with a top coat stain?

The best application techniques for achieving a flawless finish with a top coat stain include applying thin, even coats with a high-quality brush or applicator, allowing each coat to dry completely before applying the next one, and sanding lightly between coats to smooth out any imperfections. Additionally, following the manufacturer's instructions for application and drying times can help ensure a professional-looking finish.