In reply to Roberttaylor: Or even the old favourite - Bodyglide.
It has nearly stopped me on more than few occasions. Buying decent wicking under crackers sorted it mostly, but beware - buy new ones regularly, as they wear out and the problem returns.
I was saved on the OMM last year by a chance meeting with a friend who loaned me some vaseline. i would have been in real difficulty for day2 without his kind help.