Yep. PWC is Poorboys All-in-One product. So yes, it is a polish, but as you said, it has some protection as well. Most of the posts I've read state that EX is used as a topper on PWC(EX is a type of sealant, also with carnauba

). Poorboy's World is now coming out with a new version of EX called EX-P which doesn't have carnauba in it, and is supposed to last a bit longer. Both can be put on top of PWC. If you were planning on using the S100 on top to get better protection, I think you may want to consider something else, as S100 isn't renowned for great longevity. (I'm not sure of UPP's durability-lots of differing views here on it, and I've not tried it myself). If it's just for beauty, well, then, there you go. You could also search some of Scottwax's posts to see the results of PWC and EX.