after polishing....it essentially will fill in the finer scratches that are not worth it to cut more clear coat to remove (just leave for longer durability of the clear) the glaze will fill in and deepen the condition/color of the paint!!
also, its been said not to use a sealant after a glaze, rather use a carnauba wax of choice....reason being it will not bond to a glaze....wether its true or not, I dont know, but thats what I have heard