I'd recommend:
wash-ironX-clay-polish-eraser-sealant (or better yet a coating). The wax would be an optional step to perhaps change the look of the sealant, but its not going to prolong the life of the sealant, which is a myth. LSPs start to degrade as soon as they are applied, whether topped or not.
The idea that the top-most layer sacrifices itself first, then the layers underneath start to degrade only after the top layer is gone...is not true. ALL layers start to degrade together because chemically that is how it works....HOWEVER the layering myth does sell more product.
I'd take it one step further...topping a sealant or coating can actually take AWAY from its characteristics.
