yeah if its for sale, nxt will make the paint pop for a short while. but i really dont think you could go wrong with either 845 or nxt. i am not too sure about the 3m performance finish.
Of those, on Audi silver, I've only used the 845, which was OK and looked quite a bit like #16.
The big thing with Audi silver seems to be the prep; it just doesn't *pop* unless you get it really, really nice....kinda funny in that sense as silvers go IME.
yea not looking for durability, just for that pop. i was hoping to not have to polish it at all, but if what u say is true about that silver, ill go over it once.
two best i've used on my metallic silver audi is danase wet glaze and upgp. both offer reflective properties, a nice slick finish and easy of application.
totally agree on the prep. good prep = good results. bad prep = don't bother with lsp
one very underrated product is dg 501. a chemical paint cleaner and sealant. nothing i've used gives a slicker feeling. even after wash and clay, a white pad/pc application will see your pad get amazingly dirty. can't believe what 501 pulls off. you do need to apply with a pc speed of 2. anything faster and the 501 flashes too quickly.