These are PVC figures, and they are painful to clean and paint (as you experienced). What you should do:
- clean thoroughly before putting any paint on
- use an acryllic/water-based primer as a base coat
- use acryllic/water-based paint for finishing
While the primer might allow enamels to be used, you cannot be certain that in the long run the PVC softener reacts with the oil-based enamel.
Even after the paint dries up, the figuer remains touchy due to its softness. Handle with care, since the paint easily peels off or becomes damaged.
I know why I HATE vinyl figures of any sort...
