Re: \"Welding\" Lexan or plexiglass?
Years ago, in my Navy days,  they used a product called
 M-E-K  which I believe is Methylene-Ethylene-Keytone.  It is some powerful stuff.  We just called it MEK, and it was used to strip paint from aircraft.  The smell would take your breath.  They had to use respirators.    Dip a rag in that stuff and lay it on a car, it will take it down to bare metel.  Anyway, it was used to glue Plexiglass also.  If you had the right equipment, such as a heat strip, you could bend thie Plexiglass.