How can i make a inside glass for my car?

[sundeborn]

How can i make a inside glass on my volvo 242 it is only a glass but not a inside glass. For I want to see my stickers when I'm in the car.

 

[DeeLoo]

I know i'm late, but you can duplicate the outside glass, and then you have to flip the normal of the new glass in this way you have 2 sided glasses in very easy way