For my Firethorn lower door panels I did a light scrubbing, followed by Dupli-Color Prep-Spray, then Adhesive Promotor (Color Bond bought from Ames) and finally the Ames Spray Dye. I U-Tubed the process. Not a perfect color match to the upper door vinyl but close to the plastics in the back and under dash, and I did not expect a perfect match (even the factory didn't do that). Very happy with the outcome. And not as difficult as I thought it would be.
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