How can you fix swimming pool copping COPING?

Here's a link to a page that a group of skate boarders put up that describes how to build your own coping: http://www.skateandannoy.com/features/diy/concretecoping/ You might start there. I am no expert but I would think you might want to make sure the surface receiving the new coping is definitely textured/chipped up enough so the new concrete will grab onto it well.