RFT not unfixable, unless you drive on it with no air.
The reason a RFT may not be fixable is, if you drive on a deflated tire, even a runflat you generate a lot of heat and stress in the tires sidewall. So if you had a flat ran on it for 30 miles with little to no air, replace. In you see it low, and then put air in it and drive to the repair place they can patch the leak and you are fine. *(not if the sidewall is compromised)
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