These are available through Walthers (currently in stock)...
...and work quite well...I'm told.
Years ago I saw a tutorial video on their use. Can't find it now.
Spray painting still presents a ventilation problem in an otherwise closed room. Although not as convenient as a rattle-can, using an airbrush with acrylic paint (water-based) would be my choice.
Just another alternative to consider...FWIW.