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Old 04-22-2004
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plexiglass or lexan

My overhead hatches are extremely scratched and I am ready to replace them. What are the merits of plexiglass over lexan or visa versa and is there an ideal sealant material to set them into my bronze hatch frames. Thanks
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Old 04-23-2004
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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
UV Stable
Mold Resistant
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.

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