I want to do some very course flattening on the side of a very thick cleaver. I need it to be super flat at every stage of shaping and polishing. I have a shapton extra course stone but the stone is taking a lot of damage and the cutting action with water is too slow. I am looking into getting a glass plate but they are sold out where I shop. what do you think of granite? maybe I can polish the granite to get it flatter? what do you use to attach the sandpaper to the glass. I have seen videos of people using a weak spray adhesive.