From the "Gloves and rain" thread, some guys were talking about fingertips splitting during days on the river. Mike Strahan posted: "Some people have a very hard time with skin cracking in wet windy environments, and they really need a good glove. If you have that issue, you might try some Bag Balm on your hands; it really helps. I don't have that trouble but I've seen several people use it for chapped hands."
1. I've had some luck with this for a couple of years -- only on "clean" splits. Here's a website that describes several solutions, including using super glue. From the People's Pharmacy, a herb and home remedy site (http://www.peoplespharmacy.com/archives/herb_home_remedy_qa/solutions_for_split_fingertips.php?page=2):
"One last approach readers have recommended is sealing the cracks with instant glue. A liquid bandage product from Band-Aid is formulated for skin and less likely to be irritating than a household adhesive."
Easy to carry. Quick to apply on clean splits. Useful for other things too and doesn't get strange scent on my flies/tackle.
2. AmLactin or other brand of lactic acid lotion - available at Fred Meyer, probably WalMart, also works pretty well. Stings irritated skin and a little spendy.