FC7 Plum Crazy Purple paint question

All the cars I had stripped with paint remover had red oxide primer on the metal first . Some like this EV2 orange Duster had gray primer over the red oxide. The K6 autumn bronze had gray over red oxide accept where you see the grinder marks . It was only gray and the car was all original paint never hit. This would tell me they were all primered gray over body work and the whole car before paint. The Winchester gray dart pictured in the back ground gray over red oxide.

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