Inside of the jambs and tight/restricting areas, I wetsand to 2500 and use Megs 105 on microfiber. M105 is perfect for those areas and buffs right up with very minimal effort. On difficult curves and body lines, I go to 2500 and buff it with my DA sander/LC orange or white pad/M105. The most important thing I find is to finish with 2000(minimum)/2500(recommended). The whole process of compounding is simply removing the scratch marks. The finer the scratches, the less time/effort you spend on removing them. Using this setup/process, I can generally have the scratches out with a single application of material to a 2ftx2ft area. With the orbiting motion of the DA and the design of the pad to store material in "pockets", heat/burning clear is no longer an issue on edges, swirl marks are rare, no material splatter and much less dust. Those are just a few of my suggestions when you can't use the rotary, hope it helps.