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2 pac paint is more durable than [acrylic] enamel, i dont know why people bother with [acrylic] enamel
You don't know why people still use it. You should find it, so that you knowledge becomes rounded out.
Yes, a base coat/clear coat is superior in many key ways, no doubt about that. But that doesn't mean other types of paint are worthless. It's all about trade-offs, what makes the world go round. For $450 you can't get a good base coat/clear coat paint job. And it doesn't require waxing every time you wash the car.
Of course if you are rich, it doesn't matter much. But the rest of us like options. Many of us will go with the 2-part paints. But some times, for some projects, we will choose acrylic enamel. Some 40 year old acrylic enamel paint jobs are still shiny. And it doesn't require waxing every time you wash the car.