The zaino expert has arived
jk
Ok with one ounce you should be able to get 2-3 coats on an average sized car. As Wane mentioned, the first will use twice as much as any following coats. So if you use 1/2 an ounce for the first then you should be able to get 2 more coats out of the remaning 1/2 ounce. A key thing to rember about zaino is to use as sparingly as possible, using any extra is just wasteful and complicates removal. Use as little as possible, just as Wane said emagine it is $1000 a bottle. I can get about 2 coats done with 1 oz on our MDX.
About removal I just use a clean 100% cotton towel. I rotate and switch sides on the towel often. You dont have to get everything off when you remove it, yes try to get most but hopefuly you will be using the Z7 spray after you remove the wax, which should aide in removig the rest. If you havent already got special towels just for waxing I highly suggest doing so. I suggest Fieldcrest Royal Velvet 100% cotton towels, the hand towel size works best. For waxing I have 2 hand towels and 1 of the griots garage 100% cotton rags to apply the wax.
Oh and for those newbies out there that dont understand what bottle we are talkign about, it is one of the small bottles that come with the ZFX. The 4 included bottles are all 2 oz each so when I speak about using 1oz, it means half the bottle.