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They don't make paint like they used to but thats not the only reason for orange peel.
I used to work with a guy who was Quality manager of the UK arm of a large multinational automotive paint company.
Orange peel is often said to be as a result of the more environmentally friendly paints which is partially true. But the main reasons are the speed of application ie too much paint too quickly or dried too quickly (time is money). This can happen even with the solvent based paint. Secondly a slightly "orange peel" finish hides some of the imperfections that happen as a result of the build process so you don't see the smaller imperfections of the body. So it can be somewhat deliberate.
If you have seen the megafactories X3 program this orange peel could be seen in the functional e-coat which is the base layer.
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