I just had similar idea ! Corn starch is the gold standard.

Yes, I have and I think it helps.

Yes, I use a Medicated body powder and a Cornstarch Baby Powder.

Worked for a colon rectal surgeon for 13yrs. We dealt with numerous patients who suffered from Puritis Ani aka sweaty ass, lol. The physician always recommended to use corn starch which actually works.

When I was in the hospital they used something called Nystatin powder and strips called whick away the for body rolls to keep dry in between to he tummy. the hospital just gave them
to us!!! I got lucky. I was a model patient and they gave us a whole bunch of stuff. No it was not on my hospital bill. That bill was really itemized down to those ugly no slip socks!! They're so fashionable, NOT!!! LOL!! LOL!!! LOL!!!!
I LOVED Gold bond corn starch too!! I not used the spray!!! Real tears people.🙄Good Luck!!