[robchalmers]

depending how large the sheets are, put them in your oven (on bak-o-foil) at roughly 180F for half an hour to dry it. It'l bee a little softer as you pull it out, simple offer it up to the area you want and hold it at on end with a clamp then put a 60W lamp near it (3") then leave it to soften and with oven mits push over the con tour you want.

If you can remove the grille and lay it flat so gravity can help even better.

I use Lexan in RC car bodies and the only time I've got bubbling is when I've been doing very focused stuff with intense heat in one area, its best to keep the heat more generalised