I then worked the filler down with a 3M 320 grit sponge block moving onto 400 and 600 grit wet / dry paper wrapped around rubber profiles for the center / spoke areas and used a wooden paint stir stick for the outside / edge areas. Patience required here, I filled / sanded 3 separate times to get it perfectly smooth. After that I scuffed up the finish with a Scotch Brite type pad to ensure a good bite for the paint.
After a wipe down with the Paint Prep I applied the Self Etching Primer:
After drying 24 hours I applied the Duplicolor Silver as a base coat prior to the Wurth (much more expensive) paint, Note how "Metallic" the paint is compared to OEM Porsche wheels:
