Swirlbuster polish is less aggressive and it also contains fillers. I recommend you use SFX 2 instead because it has better correction capabilities and does not contain fillers, so what you see is what you get. It is a great polish and my favorite. However, it works best on soft to medium clearcoats as it is not that strong. Use it with the DAS orange pad or the green pad and you've got a great combo. I also recommend SFX 3 as a final polish with the blue DAS pad, it leaves a really nice shine.
