I brushed one coat of Humbrol Gloss Orange. It was a old tin slightly thinned. I primed the silver plastic with one coat of Plastikote White Sandable Primer from a rattle- can. I use soft synthetic brushes from the Art Supplies Department at my local Hobby Lobby store. I don't own an airbrush. I have been brush painting for almost sixty years.
Adios, Larry.