I use a white polishing pad for all SSRs (that is with Lake Country, color varies between companies). Because of the abrasives of the cutting pads, I don't want to induce any extra micromarring into the paint so I just don't use one with the SSRs; especially SSR2.5. I think a lot of people make this mistake. They go out with a brand new bottle of SSR2.5 thinking it'll remove all swirls and scratches. They use a cutting pad with the PC and use the improper amount, not the right pressure, don't work it in long enough and the finish is far from being swirl free. User error plain and simple.
Using a polishing pad, a small bead of product around the pad, light pressure, and working the product until it is barely visible will yeild great results, IMO
Don't be afraid if you use SSR1 or 2 and the color doesn't wash out, you now have a pad designated for that product. The pad will be fine

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As for the PP, it is a chemical cleaner. With a polishing pad it'll clean up and oils or other crud on the paint leaving it perfectlly clean for a sealant or wax to adhere to the paint. Now if you use a cutting pad and a rotory with the PP, it'll get abrasive because of the pads' abrasiveness. So for the cutting ability it is pad dependent. PP will also clean up windows, polish metal, clean the paint, etc. Very versitile IMO.