I've used Zaino too. It's what I used before using Adams. I remember I was very impressed with what Zaino did the first time I used it but I was moving up from Turtle Wax, Meguiars, ect. Jumping from Zaino to Adams was less of a difference because they are competing at a higher level. I've yet to do a side by side because I put my Zaino away and don't feel like mixing it up and doing all the work of striping the finish and applying it. I bet you could layer the Adam's paste wax over Zaino with great results but I don't have any first hand experience, and every finish is different. Let us know what happens. I'm curious to know.