I started using Cetaphil Moisturizing cream on hands and have been able to eliminate painful cracks on my finger tips during river trips. I use Super Salve on my heals. I think the key to anything is to apply often, 2 or 3 times a day, at least on hot, dry desert trips.
I also use leather gloves for the major rigging at the put in which, I think, helps keep your hands from getting dry and beat up.
Karma is like this: If we set causes in motion the effects come back to us.