anyone know how to join two parts of a piece to remove it from the mold? I need to know it for make part as this

http://www.carbonmods.co.uk/Images/p...bre-airbox.jpg

I see the union of the two symmetrical parts taken from the mold, but as a stick or bind?

thanks

Another question... Which material used Enzodesigns for make the mirror of F430? Is fiberglass?