Identify the defect before choosing the process
Different defects need different depths of correction. Mismatch the two and the finish returns within days.
- Swirl marks: wash-induced, cobweb pattern under light — fully correctable
- Water etching: mineral corrosion; light cases polish out, deep ones leave craters
- Oxidation: UV fading, worst on red and black — needs medium cut
- Deep scratches: if your fingernail catches, it reached base coat — needs paint, not polish