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people get mixed results with glue on patches for TPU inner tubes. heat welding might be a better option. but these days you can get chinese TPU tubes for just a few bucks each and you should rarely get punctures if your tires are of good quality and condition, and if you know how to mount tires properly and keep them inflated to the right pressure etc, so perhaps you might as well just replace the entire inner tube once in a while and not have to worry about any potential slow leaks or degradation over time.
