Q. On using talcum powder inside shoes or boots during Shabbos (see above question 2414). Would everyone permit if you put the talcum powder before Shabbos?
If there us no eruv, is there a problem to carry it outside?
A. Cheshev Hoefod (2: 59) permits according to all opinions since this is seen just as returning a bandage that fell, which is permitted (See Shulchan Aruch 328: 25 and Piskei Teshuvos 328: 49).
Horav Shlomo Miller’s Shlit’a opinion as mentioned in the question above is similar to be lenient, and the Rov added that there is no issue to carry the powder on the street as it became part of the person.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a