Speaking of cracks on fingertips, my thumb has had a crack for weeks, but it's finally healed. I found some really good band aid for this, called Hansaplast finger strips. It's not thick, but has double length, so it doesn't come off easily. :) Another one I tried is a kind of almost u-shaped band-aid which is similar to the one showed at the bottom of this link (2nd last to the right). That is also good, but expensive.
http://www.google.com/search?q=finge...iw=918&bih=717
The H-shaped ones, I haven't seen here. Very smart!
Do you know of other good ones for finger tips?