Caulking the outside

If you go with Geocell Proflex which in my experience is the best, you better have strong hands or an electric caulking gun. That stuff is very difficult to get out of the tube unless you have a large part of the tip cut off. Cutting off just a small portion of the tip trying to get a narrow bead is an exercise in futility. I did that with the first tube I bought and I squeezed so hard trying to get the caulk to come out that I bent the caulking gun handle (for those of you wondering..did he puncture the foil on the tube..Yes I did. Not my first rodeo)Also, plan on throwing away what you don't use. It's expensive but unless you plan on continuing the next day, forget it. That stuff left in the tip cures and makes the rest of the caulk useless unless you want to slice open the tube and glob it on somewhere. Then it would work fine.