Applied recently, can't comment on longevity, but application is pretty easy, 100ml will definately cover seats, not quite enough to fully do the carpet as well.
The sprayer it comes with works well, but consider it single use. I wasn't sure if I was going to have enough liquid to do carpets and seats, so applied to seats, waited the 3 hours for it to dry, then applied to the carpet - in the mean time the product had started to clog up the sprayer and it was spraying out more large droplets and leaking.
Left the windows open in the garage overnight and the smell is completely gone (it is quite strong while applying and for the first few hours)
