When someone says "CA Glue", I think of generic super glue, something like Krazy Glue or Loctite Super Glue, but sealing a car in the stuff could be costly and could cause your fingers adhere to just about everything and anything. I also hear people use CA glue for fenders, and in rare cases, as a lubricant. For fenders, I typically use Elmer's wood glue (or something similar) and reinforce it with Bondo, which makes for a nice smooth transition from fender to body (probably does nothing for speed, but the car has to look pretty as well).
What do you use for CA glue?