if you have sand scratches in it you should go back to square one of compounding, whether that be foam or wool. This is if your scratch is 1500-2000. If it's something below that you should wet sand the area with 1500- 2000 then step up to 2500-3000.
The biggest mistake I have seen in cutting and buffing is people going off to the next stage before they're even done compounding. You generally want to get everything in the compound stage or damn close to it. This makes the following steps very easy.