FP contains abrasives. Try it if you want to remove light marring, but be prepared to move up to something stronger like IP or DACP or 3M PI-III MG, because it is fairly mild.
SMR is a different animal. It contains abrasives, but also fillers to hide swirls. FP has none of that. It leaves paint squeaky clean, literally. I can hear it squeak when I take it of with MF.
The real question is, if you use FP, do you need AIO? Some may disagree, but I don't think AIO is abrasive, but it is a whale of a cleaner. I just don't think that you need to get your paint any "cleaner" if you have used FP. I guess it does other things like sealing, protecting, shining, providing a base for SG, whatever, but we don't have a Mr. Z to call and ask. Personally, I love the stuff. I use it like ketchup. Easy on, easy off, no waiting. I'm just not always sure WHY I am using it. I use it on my wheels and under SG, UPP, even Zaino.
