I contacted SLiME's support people and here's the response I got: ************************************************* Dear Bob, Unfortunately, we do not recommend using either of our two SLiME formulations outside of their intended application. Our inner tube formula, which is what you would need for your tractor tires, is a 100% fiber based formula, which is best suited to treat small punctures in thin-ply tubes. Our Super Duty sealant is a blend of fibers and rubber particles which treat large punctures in multi-ply tires. The Super Duty also contains rust and corrosion inhibitors as well as a pH buffer, all of which work to prevent damage to exposed rims. Please note that the main drawback in using the Super Duty in your tubed tires is that it won't be nearly as effective at treating small punctures. It won't harm your tire/tube, but it may simply not work as well as. If you choose to install the sealant, as it's the one you have on hand, we cannot guarantee its efficacy. Hope this information is helpful. Please let me know if you have any further questions. Best regards, Corinne Harrison Customer Service Manager SLiME Tire Sealant ************************************************* So it looks like I'll be buying some of the stuff made especially for tubed tires. Oh well, what's money for if not for spending on old tractors? :-)
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