Ferrel cement, a lighter, and extra tip top is standard in my tackle bag. Worth carrying an extra that is a size or two too large as well so you can keep fishing after your buddy breaks the top off your rod down a foot or two where your regular tip top is too small. The ferrel cement softens to glue-like consistency when heated with the lighter and hardens when cool.

Here's a quick link for those who have never done it before:

http://www.youtube.com/watch?v=EUn0SRZT5_0