| Paul first of all forget moulding a canopy with such a deep draw out of sheet employing this method,it simply will not work,what you need to do is to vacform the canopy,best to make up the plug from block balsa or even softwood,take or send it to a specialist who will run you off as many as you wish.
True Perspex is no longer made and my notes are out of date,modern clear commercial sheet is called Acrylic,it has a distinctive sweet smell to it when moulded and used a lot in the double glazing industry,persex was used originally in making full sized aircraft canopies as it was good for getting things optically perfect,its use can be quite critical as regards working temperature.
Also do not forget to slightly undersize your plug to allow for the thickness of the clear sheet.
There are also many other clear sheet materials with obscure names,some have plasticizers added others without,check out craft suppliers such as Opitec who may be able to assist with vac forming supplies,vac forming is much preferred for anything with a deep draw to it.
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