Go slow, use a Sharpie, and stop often to visually inspect what you're doing. Also, the black compound works well in its own right, makes a toothier edge for EDU. So most often I'll grind with the fine side of a Norton Crystalon stone, refine it with the white compound, and maintain it with the black compound or a combination of black and white compounds depending on what the tool is used for.
Interesting - this is essentially the same method I use for my waterstones. Grind with the 1000 grit, refine with a backhoning (stropping) on a 6000 grit stone, maintain it with a 4000 grit waterstone. Keep in mind, an abrasive on a conformable surface - even thin paper over a stone - will reduce the effective grit size by a considerable amount. A 600 grit abrasive used on a strop has an effective scratch pattern of something closer to 1500 grit or smaller.
