Ds, it's the shortened cure time that allows one to layer up to three coats/day with ZFX.
Other benefits include shorter dry time, increased initial surface hardness, better shine, better swirl-filling ability of Z-5. Of course, a lot of this is very subjective and may be psychological. i.e., it's the "Oooh, the paint feels even slicker with ZFX!!!" phenomenon.
Hey IM that's funny, after using Zfx for a year I decided to try Z1 just to see what the difference may be. I would swear my Z1 base sets a slicker finish.
I am on my second order of Zfx, it seems this batch is more difficult to remove than I am use to, anyone notice a difference btwn ZFx brews?