Andy,
As Billy stated the color will not match from the spray can and the paint gun. If I were you and wanted to paint the smaller pieces first then I would buy my paint, set up my spray gun and spray the parts with the very same brand/color paint I will finish the tractor with. This works well if you keep the paint shaken very well and keep the materials in suspension. Otherwise the paint settles out and you get a slightly different shade each time you spray. Don't be shy about taking your paint back to the supplier to get it shaken again and again before using it. And don't think you can shake it "good enough" by hand. All body shops now have their own paint shakers and you can hear them running about any time you drop by. If I were you I would sand off the paint you have sprayed from the can. If not, when you spray the paint from the gun it will most likely lift the softer, unactivated spray can paint. Then you will have the paint job to do over. Better to do a little bit over right now while it is easy to get to the parts rather than having to do the whole tractor over because of some small mistake that was easily corrected ahead of time. All of this is based on the assumption that you are just trimming out the parts in preparation for final assembley and painting from the gun. If you are painting them and then aiming to mount them after the tractor is painted, you are are going to have parts with different shades of red and varying degrees of gloss and life expectancey. been there, tried that, got the tears to prove it. Do it right and make Grand Pa proud. Besides...Farmall red is about the prettiest red around. It would be shame to mess it up because you tried to save a little time. my 2 cents worth..
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