Ron3rd: I don't know how long Slick Mist lasts, but it is so easy that I use it every time I wash the car or rv. The car gets washed about twice a month and the rv about the same when we are traveling. There are some video reviews on You Tube and they are very positive. Any rain or water beads up on the surface of the car and rv. I doubt that it lasts as long as NuFinish, but then I used to take hours to wax the car or rv with NuFinish.