once before it was a very hot day out and i had to drive to the store in my car with no a c and i sweat so much that a had sweat stains on my butt and other embarrassing places.
that might help my arms, but one time i sweat so much on the way to the store that i had a big sweat stain on my butt!
that must be really hard to deal with. have you tried an aluminum free deodorant? it helps me