From a technical chemistry view, John Deere dealership paint is modified alkyd enamel and offers the POOREST UV protection/fade resistance of any paint line. It's 1930's technology@!!! Also, hardener has nothing to do with improving UV/fade resistance.
My suggestion would be to do an experiment, for I have. I painted two implements, one with dealership paint & one with automotive single stage urethane & left them outside for six months. RESULTS: Dealership paint faded significantly & no change in the urethane.
I suppose dealership paint is fine if you never take you equipment out of the shed.....!
PPG, Dupont, Sikkens, 3M, and other leading paint manufactures distribute paints that match John Deere green & yellow well. You just need to do your homework!
The attached was painted (1 piece at a time) w/ PPG products.
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