I'm new to the contractor world. However the little bit of experience I have with PVC I have never had to sand the ends of the pipe. (unless there is a lot of burs) There is a guy I'm working with who says your suppose to sand the pipe before priming and gluing. The direction on the cans don't say you have to. So does it matter? I kind of would like to rub this in his face if possible. He needs it. Some people think they know it all. LOL. Thanks for your reply's.