Stupid Idea - But it did work .
I Wanted to create a better canopy for my Aurora F-111 Aardvark .The original was so blurry as to be useless .
At the time I did not have a Mattel Vac-U-Form . So I heated some clear sheet in a toaster oven till it was almost liquid I thought . I dropped the hot plastic over the original canopy just as my wife said " No Don't do it , You'll ruin it ! ."
Surprise ! after it cooled off I popped it free , and it was better and clearer than the original! . I wouldn't advise doing this though . Sadly I tried it with a model car roof later and totally ruined the roof . Lesson learned . T.B.