If you sand down your seal stone for any reason don’t use too fine a grit of sandpaper on the seal face—don’t bring it anywhere near a polish. You want to remove any tool marks of the saw, file, or course sandpaper but no more. Without a little “tooth” to the surface of the stone you won’t be able to get the seal ink to stick to it when you go to stamp it on your artwork. That’s why it’s hard to get a good impression from jade, quartz, or metal seals—because these hard materials won’t pick up ink well and will leave an uneven impression when stamped. About the only way around this is to re-stamp your seal in the same spot with the use of a seal ruler.