 Well, my concern is that I don't want to just fix one spot, and then all of a sudden it pops up in another spot. I don't think this thing was ever coated with anything on the outside. Okay. So if you were to dig down, you're probably going to find some cracks, even though you don't have any on the inside. There's usually about five times more cracks on the outside. I would probably patch those with a hydraulic cement.