How can I effectively apply shellac over paint for a durable and professional finish?

To effectively apply shellac over paint for a durable and professional finish, follow these steps:

1. Ensure the painted surface is clean and dry.
2. Lightly sand the painted surface to create a rough texture for better adhesion.
3. Apply a thin coat of shellac using a high-quality brush or sprayer.
4. Allow the shellac to dry completely before applying additional coats.
5. Sand lightly between coats for a smooth finish.
6. Apply multiple thin coats of shellac for added durability.
7. Allow the final coat to cure for at least 24 hours before using the surface.