no, the magic eraser isn't a brasive at all. well maybe as abvresive as say,tissue paper. it's made from some synthetic fine sponge material and gets some micro suction(sp?) going on. when using for the first time just buy every damned box of it in stock. you'll save your self a trip back to the store. also kicks ass on rub rails. better than acetone and won't **** up the gel coat wax job. after hitting the interior with the eraser i go over it with the turtle wax interior stuff. floresent green bottle that says 2001 or 2002 on it.