I am interested in learning the ins and outs of forming Plexiglas. I want to put a skylight in my airplane. I want the skylight to have a curve outward of about 2 to 3 inches. I have looked at the You Tube videos, but they are mostly about forming thin polycarbonate such as for landing light lens etc.

Does anyone here have first hand experience about the best way to heat up the plexiglas? Also what is the best material to use as a form? How smooth does the form need to be? Is there something that I should use over the form before I stretch the plexiglas over it, such as a sheet of Tyvec? I am using 3/16" thick material. It will end up being about 34" square with about a 2 to 3 inch bulge, so I am not looking for a whole lot of curve. In an effort to keep the experimentation down to a minimum, I would really prefer to hear from those who have first hand experience verses theorists.