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I would go with silver as it's going to be cheaper and zinc oxide white, if I remember right has this nifty property where it is able to reflect light and heat and also radiate heat faster then other colors, and over time that silver galvanized metal is going to turn gray from the zinc turning to an oxide.
It's also a classic and if you are going to buy a roof that will last 100 years go with a classic, either way the paint is not designed to last 100 years.
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