I use some stuff called AmLactin made by Upshur-Smith. I got it at WalMArt. I've tried quite a few things including bag balm & Crack Cream & this is better IMO.
This stuff is a little pricey, about $12 or $13 for an 8oz bottle, but it sure beats the pain of cracked fingertips.
Be advised, it stings like all get out if you have any cuts or cracks, but it only lasts for a little while.
Tom
Few things are harder to put up with than the annoyance of a good example.