The soldiers can now be primed, painted and finished to clear coat.
The primer is spray paint, definately done outdoors. The colors are enamel, usually 2 or three Coats to get the deep rich coloring, the figure in the center has a single coat. Then finally the acrylic overcoat to protect the layers of paint and make the figure easier to touch.

White primer give the enamel color a richer tone.