I’ve got some liquid mask coming - if you want to experiment with that I can apply a coat with an airbrush to a couple of figures if you leave them on my doorstep!
I think - but I've no experience with figures just polycarbonate car bodies - is that you apply a coat to the entire figure, then gradually remove the mask with a scalpel where you want to paint. Could get some crazy sharp edges that way.
I’ve got some liquid mask coming - if you want to experiment with that I can apply a coat with an airbrush to a couple of figures if you leave them on my doorstep!