I realize that this thread is old.

There are a number of different caulks that you all talk about. Dec-o-seal, polyurethane, etc.

At http://www.poolcenter.com/service_su...g_supplies.htm, they list self-levelling, semi-self-leveling, and gun-grade caulks. What are the pros and cons? My caulking has cracked and come out of the joint in a number of places and needs to be replaced. Is it sigficantly easier to get a good-looking outcome with one versus the next? Does one last longer than the other? Do all require that you mask the joint with tape? Use the backer rod?