Molding A Mask...well Sort Of

[jason8844]

i sculpted a mask particularly off slipknot charictors, i made a skull (sid) shape to it with a chris fehn pinochio nose and im planning on adding craigs nails to the top of it, i put a layer of household plaster on it and rubbed it over every area with my fingers, then i added fiberglass sheet to it wich i had laying around in my basement to give it support, its looking really nice but does anyone know what i need to do as far as making it a stronger mold? also drying......opions needed
thaks,
Nick