Regarding the difference between painting works and anti-corrosion coating works in the Petrochemical 2007 budget quota

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Regarding the differences between painting work and anti-corrosion coating work in the Petrochemical 2007 budget standards, the common views on the Internet are as follows: 1. Painting work is suitable for ordinary environments, while anti-corrosion coating work is suitable for acidic and alkaline environments. 2. The cost of painting work is lower than that of anti-corrosion coating work. 3. The service life of painting work is shorter than that of anti-corrosion coating work. 4. Design documents for painting work only specify the number of coats to be applied, without specifying clear requirements regarding the dry film thickness of the coating layer； Corrosion-resistant coating projects are quite stringent, with clear specifications for each layer of paint; the type of paint is specified, and the thickness of the dried paint film is also limited. So, are these differences correct? Are there any other differences? When preparing the bid quotes and determining the cost estimates, should we choose painting or anti-corrosion coatings? What is the basis for the selection?