I'll chime in altho' others with way more experience will as well. I've worked with just what your working with and here's what I know. 1. Ratio of primer/catalyst is 2:1. I throw in a little primer just to get it to flow thru the gun. There is no ratio given for primer as reducer is not called for. You have about a 4 day window to topcoat, otherwise you must scuff with scotchbrite and reshoot primer. DO NOT prime/paint below 70 degrees and preferably low humidity. On a nice day you can topcoat within one hour of priming. (at least i did with no bad results.) 2. I set the compressor at about 75 lbs. and the gun at about 20 lbs. Worked for me. 3. the primer is non sandable. If your prep work on the tractor is first rate , you'll come out with a nice smooth finish with the primer. The metal prep work, btw, is 90% of the process. 4. I strongly urge you to get a supplied air system. Your health is more important than painting the tractor. My .02.
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