There are several ways for painting armor.
1Don't paint but polish. Then paint the shades with a diluted black, or tamiya smoke.
2:Mix Printers inkt silver with a black. Let dry and shade with black and highlight with printers inkt.
3:Mr Metal (gunze sanyo) this is a paint you can polish.
This are my three ways for painting metal. I'm sure there are more ways for painting metal. They will come up from other guys.
BTW: Welcome to the Planet.
marc