Sharpening DMT
sandpaper rolls, but few rolls come in grits higher than 400, and your brand choices dwindle past that point. You''ll need a flat surface on which to adhere the sandpaper. You can use glass or granite, but we find 3⁄4"thick MDF flat enough for everyday sharpening. Adhere the sandpaper to 3×8" blocks of MDF, as shown at right.