I use it routinely when repairing bicycle tires. But that’s my only need for talc, so my current supply will likely last beyond my last bicycle tire repair. Then it will be estate-talc … lol … …
Speaking of bicycle tubes, I watched a tv show last night about a fellow in Japan who makes stuff out of old bicycle tubes, womens’ purses for example, selling for over $100 each. Do you folks use old bicycle tubes for anything? I use them for rubber bands, robust rubber-straps for face masks, & vacuum cleaner belts. If you get annoyed by the cheap face-mask over-the-ear bands stretching out making the mask not fit correctly, try a bicycle tube version, works much better.