Description of problem:  
    Sanding marks or swirls show through after the polishing operation.

Causes:         
    – Topcoat is not through dried.
    – Sanding paper is too coarse.
    – Unsuitable polish.
    – Unsuitable equipment.
    – Polishing through on edges.

Preventive measures:
    – Dry topcoat thoroughly (rebake if necessary).
    – Use suitable polish and equipment.
    – Use appropriate sandpaper.
    – Use polish free of ammonia.

Remedy:
    – Thoroughly dry top coat. Sand and polish or repaint.