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plexiglass or lexan
A good primer:
“Synthetic Rubber-Based Adhesive Sealants”
From "The Practical Sailor Library - Volume IV - Do-It-Yourself Improvement Projects"
There are numerous adhesive that are formulated for bonding Polycarbonates* & Acrylics* (glazing) to FRG.
*Lexan is (GE) polycarbonate, which is much more shatter resistant and harder than Acrylic.
*Acrylic Plexiglas, Lucite, Acrylite, and Perspex are polyacrylate. Acrylic is more scratch resistant than Lexan.
Whichever adhesive/bedding compound you select should be:
Chemically compatible /w glazing & substrate
and have whatever mechanical characteristics your specific application may require (gap filling, sandable/paintable, etc). A window/glazing shop is often a good source.
Most plastic parts will have residual mold release or wax on the surface; before bonding, this should be removed with a suitable solvent-such as Acetone or Methyl Ethyl Ketone (if necessary)- and then abraded, lightly, with a medium-grit emery paper.
In all cases, parts should be bonded as soon as possible after pre-treatment. If bonding must be delayed, I recommend that the parts be covered with a light tissue paper and stored in a non-contaminating, dry atmosphere.