Never tried this, but seems like a number of people have decent results:
http://wholenaturallife.com/2012/07/06/ ... deodorant/
http://www.youtube.com/watch?v=JOqUD82Uj5U
Milk of magnesia for hyperhidrosis
Re: Milk of magnesia for hyperhidrosis
Seems to be that it works as a deoderant, rather than an antiperspirant. That is, it might stop you smelling but doesn't prevent sweating.