As Steven said, a quality paint job is 99% preparation. The automotive type finishes people are putting on tractors nowadays is very unforgiving stuff. It just loves to show off what's underneath it. Sand scratchs, improperly feathered old paint, etc. will all show through. When I had my own one man body shop, specializing in restoring pickup trucks, I finally made an unbreakable rule. I did not paint anything I had not done the prep work on. People would always want to do their own prep work to try to save money, then when the final result was lousy, it was out there on the street with your name on it and the owner telling people what lousy work you did. People would come in, just wanting me to "shoot some paint on it to make it look better", and then leave in a huff when I told them if that's how they wanted it done, they'd have to go elsewhere. Back to the original question, anything cast is more forgiving than sheet metal, and some blending solvents will soften the substrate to allow new paint to adhere. Most old tractors we're dealing with probably still have the old alkyd enamel on them, that might be worth a shot.
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