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The number of stages is irrelevant... sorta.
If you want a good-quality paint job, you will want dual stage color then clear. Single stage is nice, but will not last nearly as long and is much less durable in the face of UV's, the elements etc.
Factory Nissan exterior paint is two-stage. As far as your engine bay and other areas go, I am not sure exactly what they did at the factory, but it left a lot to be desired haha!
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