I just got myself some Alclad Stainless Steel at my LHS today. I'll use it for all the radial engines I have to paint in the future. I planned on using Gunze Metalizer (the stuff you have to polish) for the engines, but they only had the darkest metalizer (way too dark) in stock, so I just got me some alclad instead...
And I can tell you one thing: It will produce a horrible NMF. It is really dark and doesnt look like aluminium at all. It is great for engines though...
I hope I could help.
Cheers, Clemens