From what i've read from Brettl-0 Not particularly. Jet seal is what you use before wax. Wax gives you depth which isn't particularly nescessary on a white car.
He has actually recommened the V7 to me a while back in lieu of jet seal which he said would be a little bit of a waste on my particular colour
Hmmm youve gotten a bit confused there Adam. Jetseal is awesome on silver. My old stagea was silver and i layered up about 4 coats of Jetseal and it looked unreal.
I suggested V7 because of its stupidly quick and easy application. This was when you hated cleaning your car.
You COULD apply a wax over sealant to get the added depth that sealants usually dont provide. But you wont get that on white or silver/gold anyway, so its not neccesary. I only ever put wax over jetseal if the customer asked for it, or it was being entered in a car show or other events. Only a real keen eye can pick the difference in most cases.