Thanks for the comments; I appreciate it! I've painted other props, but this was a first on the ABS material on a trooper helmet, so in the beginning I was a bit unsure how things would work out.
Sure no problem! I had originally wanted to do a "chipped" look, so I bought a can of Krylon khaki type color, but decided to pass on that after I then decided to keep the white paint intact. I did first take some fine steel wool to knock down the shine of that ABS first, because I wasn't sure if it would affect how the primer sprayed on. I used a can of a reddish oxide looking color (Rustoleum flat red primer 249086), mainly because I had read somewhere something similar was used on some of the helmets. Next was the Rustoleum Pro Enamel white (I used 7592, but others should be fine). Applying it took a few quick experiments. Seeing as it was a bit colder than usual here in Seattle when I sprayed it, I made a few quick thin passes just to get some paint on the helmet, as I didn't want to get too thick of a coat on the first layer. Best thing to do is wait for a warmer day to spray. Waited a few minutes and then started to put on a thicker coat (quick, short passes, but at a closer distance to get a more glossy shine). The can says to spray additional coats within a few minutes of each other, which is a little different than other paints I've used. Waiting to see how the paint would cure was somewhat scary, as I've had issues with some Rustoleum colors in the past (stayed sticky to the touch, mainly metallics). It was reasonably dry to the touch fairly quickly (although soft), and within a day, the paint felt really solid even despite the thicker paint application. I didn't use any clear coat on mine because the natural gloss of the white was actually a lot more shiny than I had thought it would be! But a clear coat could possibly provide a more even gloss all around in case some overspray dulled things down in some areas. I'd be interested in hearing how your painting turns out! The RS helmet is my favorite. Last thing was chipping very tiny bits of paint to reveal some of the primer color underneath, hand painting the graphics, and then adding some weathering by rubbing newspaper over the surface.