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.