Here is Part 2 and lining is done using enamel paint.
Here is the 1st Iron Man made by Hot Toys. It is the Mark 3 and unfortunately the original red is just a bare resin color and the Red use is dark red rather than matching the Red from the Movie.
MARK 3
MARK 3 Battle Damage Version
MARK 4
MARK 5
MARK 6
MARK 7