I have a Necky Santa Cruze (w/ skeg) bought new as a blem primarily for river use. Fabulous boat, hard chines, lots of rocker, nothing else like it. It has had close encounters with rocks and gravel. I took a palm sander to the bottom, as well as to the blem aspects of the top, worked like a charm. I then used 303 Protectant, which destroys friction, has super UV protection, and takes longer for me to type about than to put on. That stuff is magic. Chris, if you're listening, I have 3 friends who would buy a Santa Cruze if they could...