A little hint in applying the glue: use a toothpick. Dab a drop or two onto the tip of the toothpick and then lightly spread it onto the crack. It is a bit time consuming, but this will keep the glue from gooping up. Put on a thin coat, let it dry for an hour, then put another coat on. I probably did this 4 times to make sure I got a good seal.
I've washed my car 3 times since then and drove in the rain. No leaks (knock on wood
).