[slammed57]

Yes, it tells you exactly when all scratches are gone and move on to the next grit. you can not use the guide coat on the first cut ( there are no scratches for the powder to fill) only after 600-800 or what ever grit you prefer start with.The key is to use a lot of light. a flood lamp on a stand works great, a led that straps to your head (like what the mechanics) use works decent to. when first applied and sprayed with water only a slight amount comes off but plenty stays on for the sanding process. As your are sanding you will see the scratches slowly disappearing, when they are gone I will sand 2-3 more swipes after just to be sure. it produces a consistent and even result. 3000 grit does not need guide coat applied. I also only buff and polish at 1000 rpm with a high quality pad,almost impossible to burn the clear or burn through.