Originally Posted by codprawn
Perspex will bend if gently heated - either a hot air gun or cooking in an ....
No it won't. You'll need to raise it's temperature to about 180°c. You can do a small area using a hot air gun but heating the whole screen is not feasible. If you were to use an oven, (a fkin big oven for a windscreen) the perspex would come out like a big floppy wobbly thing and you'd find it impossible to handle. This method is used when there is a former to drape, clamp or suck the perspex over.
If the curve is gentle, you may be able to ease a sheet around clamping as you go.
A alternative, which is very unlikely to break, ever, is polycarbonate. It's more expensive, softer but incredibly tough. You would be able to bend a piece of this a considerable distance. It is possible to bend double a 3mm thickness.