Re: tube question
The purpose of dry lube on innertubes is to allow the tube to expand into the tire carcass without wrinkling the tube. Any material that allows that will work. As for one type being any better than another, that's up for debate.
Powdered mica has not been packaged as a tube lube for a long time. It would be even more important to wear a mask with it due to the scarring and possible cancer it can cause in the lungs. Definitely wear a mask if using powdered mica.
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