I went to a wood working show a few years ago and bought a sanding pad that's typically used for sanding inside turned wooden bowls. The pad fits in a drill and has velcro sanding pads. I used it to sand the inside of my sons kayak. I used it a lot and found it to be a great tool. I had lost the name of the company I bought it from until I was cleaning the garage tonight. The company is Peachtree Woodworking Supply. I found the 3" pads to be a great size. I had bought about 30 pads and used almost all of them, so buy a lot. I believe the prices of the disks is for a bag of 10.