The most commonly used coating is PE (RMP) polyester, but after 8-10 years, PE polyester typically shows significant loss of gloss and fading, leading to a decline in protective and decorative performance, and may even rust. Some lower-quality polyester coatings may last only 3-5 years.

HDP high-durability polyester offers over 15 years of weather resistance at less than double the price of PE polyester, making it an excellent choice in terms of cost-effectiveness.

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