The original post reminded me of this product linked, which I've seen at Ace Hardware in the checkout line. The frank, goofy name actually describes that feeling when hot and sweaty at one time or another:
Anti Monkey Butt Powder - Original Anti Monkey Butt Powder with Calamine.
I think it's worth a try, knowing how good ole fashioned Caldesene zinc-oxide baby powder protects skin from wetness and soothes rashes, too. See Most Helpful Customer Reviews at the bottom of this product page:
Amazon: Caldesene zinc-oxide baby powder -
Click this Icon: [ame]http://www.amazon.com/Caldesene-Baby-Care-Powder-Ounce/dp/B0000Y3CWY/ref=sr_1_1?ie=UTF8&qid=143***5010&sr=8-1&keywords=caldesene+powder[/ame]