thanks for the feedback guys. I had no idea that you could use a sheepsfoot roller too much. Very interesting.
Like some other people here, I found this site after having my pond built. I have allot of confidence with the information I've gathered over the years that my next pond will not leak. I feel real lucky because it looks like I'm in the same county as one of the other forum members who seems to be an pond building expert. I'll be looking him up for pond #2 and the same mistakes won't be made.
Hopefully, if anyone has had problems with a sheepsfoot roller they will see this and provide some helpful feedback.