Oh, I *have* an airbrush... and ~50 different acrylic paints. Its the *COMPRESSOR* that is currently the sticking point! And dad told me I should put that on my Christmas list. The H2O paints are ok - rather bland/basic selection of colors and the propellant *still* melts styro if you get too close. It doesn't seal off the styro, either, for coming back to use non-latex spray-paints on.
Haven't seen the Foamcoat stuff, so thanks MUCH for that tip.
My main issue on styro is that I need something to seal a given chunk of packing foam so as to eliminate the obnoxious "obviously styrofoam" look after I paint it.