Achieving a high-polish finish on large metal works requires precision, the right tools, and proven techniques. Here are the best practices to ensure a flawless result:

1. Surface Preparation: Begin with thorough cleaning to remove dirt, grease, and oxidation. Sandblasting or chemical cleaning can help create a smooth base.

2. Progressive Sanding: Use progressively finer grit sandpaper (starting from 80-120 grit up to 1000+ grit) to eliminate scratches and imperfections.

3. Polishing Compounds: Apply high-quality polishing compounds with a buffing wheel or orbital sander. Diamond pastes or aluminum oxide compounds work well for hard metals.

4. Consistent Pressure: Maintain even pressure during polishing to avoid uneven finishes. For large surfaces, use mechanical polishers to ensure uniformity.

5. Final Buffing: Finish with a soft cloth or fine buffing wheel to enhance shine. For extra protection, apply a clear coat or wax to prevent tarnishing.

6. Quality Control: Inspect under bright light to spot missed areas or defects. Repeat steps if necessary for perfection.

By following these steps, you can achieve a mirror-like finish on large metal works, ideal for industrial, architectural, or artistic applications.