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My experience will agree red will fade but blue will change color (using One Shot). Blue tends to go toward green as it oxidizes but can be inhibited if you mix your blue with another blue, ie, dark blue with light blue will give you a color like reflex blue or as we called it in the old days Standard Oil Blue which will last longer. Mixing your red with a red iron oxide (basically rust) will also extend the red's life because it will add pigment to your dye (which your regular red is), however it will give it a darker, possibly brownish tint. I live in a climate with extreme UV and have been painting signs for forty years or so.
The best bet it to hanger the plane.
Mike
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