i have a 2000 911 cabriolet. the back window on the top isn't glass, but rather the plastic sheeting type. now, i would like the tint my windows all around, but the conventional tint won't work on the plastic sheeting. is there any way that i could have that plastic sheet window replaced with glass, perhaps by the dealer. or can you guys think of any way that i could tint that back window without replacing it as glass? i was thinking of using the same material for smoking lights, but i'm sure that would be too dark...