Paint is not only for good looks, but is critical for protection against rust. And unlike Florida parks which generally paint stuff all the time, every-year (to upkeep the clean image), most northern parks apply "as needed", or basically when the protection the paint offers to the steel is no longer adequate.
And paints like this can be very pricey... I had to gather information from various paint vendors to repaint a large forging press, and there is so much that goes behind just paint. In this application it is probably not as critical, but still important (and pricey!). You can't buy this stuff at Home Depot :)
-Steve
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