So I have a latex mask that's all painted up, and it's nice and all, but I'd like to harden it. I thought about coating it in resin. The last time I did that with a mask, it worked fairly well, though I guess I didn't layer the resin on thickly enough because it started to crack in places, both the paint job and the resin coating. Should I do it again or is there a better way to stiffen a latex mask?