It kinda depends on where the runs are. If it is on an area of the tractor that you will focus on when you look at it, then you might be better off deciding on an area to sand and recoat. If it is in a non critical area, the process is as follows: 1) Mask areas that you might scuff that you don't want to. 2) Use a hard cork or rubber block with a minimum of 400 grit wet paper to start. Step up in grit to 1500 as you get close to flush. 3) Clean the sanded area thoroughly in between grit changes. Clean the area again after sanding is done. 4) Apply a small amount of compound that is rated for plastics and plastic type finishes. Usually you rub gently, let the compound dry and buff with a soft clean cloth, turning the cloth often. The finish needs to be cured to the point of being able to accept washing before trying this. Take some scrap metal, paint it up the same as the tractor, get the paint to run and practice. If you are careful and patient, you shouldn't have to buff all surfaces.
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