While I have heard some strange things before, I don't think that this story is true. Cement, mortor, or what ever would have been used is not light weight at all. Next time that you go to a hardware store, look at a 60 lb. bag of cement, it's really not that big at all. Now add the additional weight of the water that would be used to mix it (8 lbs. per gallon!). Pouring wet concrete onto the car would have crushed the windshield, hood & louvers, if not the majority car as well. In addition, the cement will expand and contract with the temperature changes in the weather. In this case, the cement would easily crack and because it would not expand and contract at the same rate as the metal & fibreglass underneath. Example: the same thing will happen when if you don't use the spacers while installing the rear view mirror onto the windshield. To prevent this, both expansion joints would have to be used, and the concrete layer applied would have to be at least no thinner than 3 inches thick (4-5 in more severe climates). This is because there wouldn't be anything underneath to absorb the heat, and let the concrete expand/contract graduly and evenly. Concrete might then "chunk off" the car. Another reason might be that the cement may not properly adhear to the surfaces because they would be too smooth. Unless of course they doused the car in Elmers White Glue first (a trick used to adhear a newly poured layer of concrete to the old, cured layer underneath). If all this was done, the end result would probably be a lump of concrete, rather than something that resembles a DeLorean. -Robert