I have found *personally* that if I do apply Z2 Pro I dont use any other carnuabas on top for while (meaning 2-3 months) Once you notice that the Z2 Pro's protection is fading a little then go for the nuba. Once you apply a nuba on top of the sealant you will have to strip the surface of remaing nuba in order to apply more sealant layers. So as Porkenbeans said above, basically enjoy the Z2 Pro characteristics for a little bit then add your choice of nuba when you want to change it up.