i think he did it with a magnum.... me and my boy went out a while back and i used his magnum and he used his zig posterman... his got buffed real easy mine stayed up.... but the zig was easier to work with... can you change the nib on the magnums???
i used postermans a while a go. but the ink is water based. that's how they get buffed so easily. replace it with your own ink and you are good to go. speedball ink and powdered plaster works wonders. :shock: