I am trying to make a wing for my race car. My ultimate goal is to make a mold so I can make a hollow wing for me, and have the ability to make more for my brother and dad. I have the XPS foam core that was cut out in the profile that I want and I have been kind of stuck as to how to go about prepping the foam so I can make a mold. 

My recent thought has been to cover the foam in a carbon skin, use mylar over the carbon to keep the surface smooth, and vacuum bag it during it's cure. Once it's cured then use the skinned wing as the part to make a mold from. Will this work?

Is there a standard practice to make a wing mold that I just don't know about?

Thanks for any help!

Patrick