Sorry, I didn't even see this thread before.
I didn't believe it when I saw one of my cousins doing it, but I'm a believer now. She was putting anti-perspirant on her feet before we left for a party and she told me that it helps control foot perspiration which can contribute to friction blisters. I didn't buy it, but I had a wedding this past weekend, so I tried it and it worked. No matter what, I always get blisters from wearing strappy sandals, but this time I was blister and pain-free. The last time I wore these heels they killed my feet so much, I ended up barefoot by the end of the night. My cousin used the clear/invisible kind, but I used Secret spray because I didn't have what she used. I'm going to test this out again, with her version this time, in about 2 weeks when I have another all day-all night event. Has anyone else ever tried this?
I also remember, if I'm not mistaken, Philosophy or some other brand had something called Take A Hike (I think), which was marketed towards hikers who tend to get blisters, which also would work for sandal lovers like myself. Of course when I go looking for it, I can't find it.