Just posted about this on a very similar thread... Topping a sealant with wax can make it look better/different (on some paints/sealants, to some people) but it also prevents you from being able to layer on more sealant later. IMO that undercuts one of the primary reasons to use a sealant in the first place. If I want to see "the wax look" I just use wax. Otherwise I use a sealant. I've completely quit doing the "wax-topper" stuff.