For metallic paints the solvent based paints are better than acrylics. Polly Scale has pretty good acrylic metalic paints, but now you can only fine them in their railroad line. They've discontinued the metalic paints from their excellent military line of paints. I suggest priming if you want to spray acrylic based metallic paints.
Alclad is a lacquer so wear a respirator if you want to spray this. Alclad is from a British company. It's for hobby usuage so you would normally find them in hobby stores. You probably won't be able to find them very easily in the PI. Alclad dries very fast and has a very tough finish. You can start masking in less than an hour and work on another layer! There's a ton of different metallic tones in Alclad.