I had a professional repaint my left rear quarter panel after a van backed into my car in the driveway. No one else ever noticed the difference...but even after blending I could see where the blend started and the hue difference between the freshly painted part and the rest of the car. It used to drive me up the wall. If you have the money to repaint the whole car that's what I would do. It's better than kicking yourself in the ass later because you can see the difference...even if no one else can.
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