I've seen some fantatis work with Alcads.
You have a wide choice and each is as good as the other
bare metal foil - no experience
aluminum foil - patience and proper planning required, but inexpensive compared to Bare metal foil
SnJ metalizer and polish powder(s) - testors and such are good but very fragile.
Alcad - no experience with this stuff
I always seal metalizers - I have yet to detect that it takes away from the look - but that is just my opinion.
I think it all comes down to what you would feel comfortale with - spray vs burnishing
3d modelling is an option
a true mental excercise in frusrtation