Hello! New to the forum.

How do i make a finnished mold out of this clay? http://carbix.se/product.html/styling-lera?category_id=25

I have made a prototype looking similar to this: http://a248.e.akamai.net/origin-cdn.volusion.com/hddtq.vzwer/v/vspfiles/photos/13440Z-2.jpg?1348857922

What would be the next step after making the prototype? I cant wax the clay or put release agent on it to make the gelcoat release...
Should  i juste throw the s*** clay away and make a prototype out of someting else?

Best of regards from Sweden, great site u have here