Glad I could help.

IMO I think that Talc would be better. I worked at a foundry for a couple of years and learned about dealing with heat. Corn starch will clump and get sticky if not rinsed. And it could be considered food. Maybe not great for you but a box of complex sugars would be a lot of fuel that you did not have to gather. Talc might clump but will continue working as a lubricant. I would rather have my hair (1-2 inches) loose and moving (help with sweat) than stuck together (actually will begin to hurt after a couple days) You won't win any beauty awards, but who cares? Comfort over beauty any day!