"Lou" wrote...
Does anyone know of a material that starts as a liquid, but hardens as
a platic?
I want to make some custom plastic parts for my plane (no not for the
structure)
that will require making a mold and then pouring in the liquid.

About thirty five years ago, back when the EAA still cared about homebuilt
aviation, there was a good article in Sports Aviation about forming plastic
sheet into complex shapes for interior trim pieces.

Rich