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Any of the temporary radiator leak sealants are just that.... temporary. They're meant to be a short term fix to get you home or limp an old car along until you sell it or can get to a more lasting repair. I know many stories (some of my own) where Aluma-seal or some other brand, has lasted a LONG time but it's still a temporary patch. This is your tractor and I would guess you plan to keep it awhile. Why not take the radiator off and have a radiator shop check the core and tank? I've had small core leaks repaired for only $10 or so. If your core is bad, your engine isn't getting the cooling it needs and you might be saving yourself some costly repairs by replacing the core now. Temporary sealants also pass through your engine and collect in the block. I've seen noticable piles of the stuff, when rebuilding engines, and always boil the block when I see it. I'd put Bars-Leak or Aluma-Seal in an old car in a minute but would never put it in one of my tractors. IMHO of course.
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