It's pretty rigid when it sets, isn't it?
I don't imagine it would have very good movement or flexibility, if any? Seems like it would be better suited to static props, like armor and weapons, not to a costume that would be constantly stretching and moving around. It could potentially be used just in certain areas, like say the shoulders or the chest to add some texture but I honestly just see it cracking. I could be wrong, but I can't imagine it holding up to the type of stress it would be put through.