DeTango- The conventional wisdom is that you need to wait, but I dunno how valid that really is. I myself would wait, but then I don't top my KSG anyhow as I prefer to add more from time to time.
Note you shouldn't just add more KSG to the area you already waxed; once you wax the KSG won't bond any more. So yeah, once you've waxed you oughta redo the
AIO before redoing the KSG.
FWIW, I always do at least four layers of KSG, otherwise it doesn't impress me all that much (looks, durability, or protection), but that's just me.