When you use the sandpaper trick, you are using a very fine grit. lol. You wouldn't go using the roughest shit out there. Steel wool will do the same thing. As long as you aren't freaking scrubbing the shit outta it, and just giving it a light rub it won't hurt it. HuCARDS may not die often...but they do die for unknown reasons sometimes. I normally use the pink eraser and alcohol trick, and that usually does it for me.