After a gray primer coat, I painted mine with Metallizer Titanium, then airbrushed over it with blue and purple india inks, followed by a clear acrylic sealer coat. Worked like a charm and matched the photos of the suit from the Cinefex article to a "T".
If you want it to flip colours like the film, them paint it silver, go to www.spazstix.com . they sell small bottles of flip paint. they do a blue,teal,purple laquer which you airbrush on it layers and it will give you the same effect as the movie suit.