Mo, I try and avoid using lacquer based paints as I spray in the house.
If I did decide to go the lacquer route, I'd probably give Alclad a try.
Bob, I used Tamiya Chrome Silver X-11, mainly because I had it to hand. I masked a few panels off, and then appliedsome more Chrome Silver, with a few drops of Gun Metal to darken it up a bit.
I also hit a few panels with Tamiya smoke as this gives a slightly darker look.
Mucker, It's probably not your prep, that is the problem, I think it is just a case of the Gunze metalics being too delicate for masking over.
Shame as I love the Gunze products, particularly their paints.
Karl