The WW fluid is used to thin (instead of water). Water can cause the paint to dry faster, not letting it really fully "settle out flat".... causing "orange peeling." WW fluid slows the drying time letting it even out before drying. Floetrol is a conditioner that improves consistency in the paint flow and settling qualities of latex. I think it helps reduce clogging your gun too. Many experienced latex painters use one or both of these, but it's "whatever works for you" that matters.

Both latex paints I'm testing are VERY thick and would never run through my airbrush as is. It's like trying to spray honey if you don't thin it at least 40%.

Neo