Dave N
My PC goes to 7...
Not to start a debate but you are using ZPC because it dosn't have fillers than you Z5 that contains fillers. So what is the big deal about not using a polish without fillers? I also try to avoid polishes with fillers but I try not to use anything that has fillers in a LSP either.
For me, the ideas behind not having fillers in a polish/SMR are:
1. You can't really tell when you've removed all the swirls if the polish is filling them in. (Actually you can by wiping w/isopropanol or some other solvent, but who wants to be doing that continuously during polishing?)
2. Fillers tend to interfere with bonding of your LSP (esp. Zaino)
Fillers in a LSP are not necessarily a bad thing, and I personally don't care if a LSP contains them or not as long as it's durable and looks good.