A gel-filled silicone makeup appliance can be made out of either a 2-part mold or a flat open mold. Materials recommended:
The following video shows how to use Q-Ballz and Ecoflex GEL in a flat open mold to make a gel-filled appliance:
The following video shows how to use Dragon Skin FX-Pro and Slacker in a 2-part "squish" mold to make a gel-filled appliance: