Talc for tubes
When I was a kid, I had learned to add talc in the form of baby powder along the tube during a flat repair. This presumably kept the tube from binding to the tire or rim during inflation.
Now, 60 years later I do the same. But I haven't in the current century haven't heard of anyone else doing this, and wonder if it's really necessary.
If nothing else, it makes my tubes smell like a baby's butt.