If i made a full head foam latex mask where would i add the flashing or would there even be any flashing and just let the excess come out from around the opening of the neck and where the mold walls meet?
KBFX Monster Tutorials I have seen it done both ways; with and without flashing. If it is a mask without a blending edge then the runoff is not really needed per se... but it does help allow any excess foam to evacuate. You will probably be using some kind of fabric embedded in the mask to prevent tearing, so that will prevent the mold closing too tight and will also allow a little of the foam to seep out.