And having that stuff smeared on your nipples is better than having sore nipples?!!!
I always have a problem with this,especially if cold/wet/windy. If the weather is like this, then I use plasters on each nip. Technical running gear doesn't seem to make any real difference.
Even Antonio Pinto gets this. His FLM run a couple of years ago, had him covered in blood at the finish. Wearing white, is not a good idea.