I got a bundle of Speedry Magic Color acrylic inks from a friend. They say they’re airbrush compatible, but I have no idea how they’ll do with plastic figures. Has anyone had any experience with them?
Check the ingredients list. If they have stuff like toluene or acetone or whatever as the solvent, it could be bad for plastic figures. But if they're just water-based acrylics, you should be fine.