depends on the size of the mask, the thickness of the mold, weather it is a master mold or a copy mold..you want to have more than you need than less than you need...for a copy mold I would say you might use about 25 lbs, just get a 50 lb bag..it\'s cheap
look at me acting like I know what I am talking about :lol:
look at me acting like I know what I am talking about :lol:
