As a surfer, this is more of a problem than you can imagine. I think the worst for me was on a trip to Costa Rica when we walked 4 miles down the beach from where we were staying, surfed for 4 hours, and then walked back in wet boardshorts. I'm talking HELL for the next 3 days. And obviously Gold Bond isn't really an option. I've used Vasoline, but it doesn't seem to last too long to me. Last year I went to El Salvador and picked up some of this stuff beforehand:
Now I never leave home without it. It's definitely going in the 'Roo bag everywhere I go this year.