Question about surface area...

Ok, so I have an imported assembly. It's an ATV frame, and Ineed the total surface area of all the parts in the assembly. Iknow this is easy, by hitting the Mass Props button.

My question is, does it calculate just the VISIBLE surface area? Oris it also counting the hidden surfaces that are touching?

I need the surface area of all visible faces for painting.SolidworksGeneral