Howdy, Aint! Congrats on getting to ride STP! That is one ride I have always wanted to do. But I'm a bit far away. Maybe someday..........

Yes, I think Chamois butter really helps, if you are having chafing issues. I use Assos Chamois Creme, if I need it, but I suspect any of the products marketed as chamois creme are similar and are going to help your uh, delicate bootie tissues slide and not rub on your shorts and saddle. A cheaper option is Bag Balm. Sold for cow's udders, it is slightly antiseptic, nice and thick, and doesn't even smell TOO bad. You can pick it up at almost any drug store. Lots of ultra distance riders swear by it. Just one hint - if you use it, don't smear on so much that is oozes through your shorts and onto your saddle. Makes it a little too slippery that way! (I've seen it - not a pretty sight!) Whatever you use, smear it in all the creases, and anywhere else you feel you need a little more comfort. For 100 miles, I'd put whatever you decide to use in a small container that you can carry with you and re-apply as needed.

Have fun!!

annie