What are the best techniques for applying black sanded grout to achieve a professional and polished finish?

To achieve a professional and polished finish when applying black sanded grout, it is important to follow these techniques:

1. Mix the grout according to the manufacturer's instructions to ensure the right consistency.
2. Apply the grout with a rubber float at a 45-degree angle, pressing it into the joints firmly.
3. Work in small sections and remove excess grout with a damp sponge before it dries.
4. Use a grout sealer to protect the grout and enhance its color.
5. Buff the grout with a clean, dry cloth to achieve a polished finish.