i did a little research and found this
Pro GlassAdvantages of LEXAN® Windows
LEXAN® coated sheet is a two sided hard-coated polycarbonate material that offers excellent impact resistance, optical clarity and abrasion resistance. LEXAN coated sheet is ideal for many functional parts requiring exceptional toughness and surface hardness.
Safety considerations support polycarbonate over glass. Glass is a brittle material. LEXAN® has proven to be a much better impact absorbent substance. LEXAN polycarbonate sheet offers the highest impact strength of any transparent glazing product--250 times the impact strength of glass and 30 times that of acrylic.
Weight savings - Using LEXAN® carries a substantial weight savings over the use of ordinary glass. For example, a 1/4" thick square foot of LEXAN® weighs 1.56 lbs. in comparison to 3.2 lbs. of glass. Another consideration is that further weight savings can be obtained because a lesser thickness of LEXAN® may be used. (An 1/8" window may be used replacing a 3/16" thick glass application).
Customization - LEXAN® windows provide you the ability to customize more readily, as they provide an ease of alteration and transformation.
Ease of installation - LEXAN® windows are molded to OEM specifications and are shipped oversize. This eases installation in bodies of different manufacturers.
The Pro Glass Advantage
Pro Glass has the advantage of experience. Thousands have chosen Pro Glass Windows for their race cars. After 20 years, we are proud to continue our tradition of providing the highest quality windows to the racing industry.
Pro Glass uses the only best material available. General Electric LEXAN® coated sheets offer excellent impact and abrasion resistance.
Pro Glass offers the optimum advantage through its exclusive thermal forming manufacturing process. This assures you of an accurate and aerodynamic fit for your windows. Also, the optical clarity of a Pro Glass window is far superior to that of other manufacturers.
Pro Glass is the #1 manufacturer of preformed LEXAN® racing windows in the universe. We assist professionals with our quality products for drag racing, road racing, stock car racing, boat racing, and more.
Pro Glass goes that extra step by spraying their windows with a protective coating that assists in the reduction of scratching and damage during installation. This water based material is easily removed upon installation of the window.
Pro Glass windows are oversized. It means equidistant to the exact size of the window. This will allow a better fit to the vehicle body.
Pro Glass has the experience and expertise to execute custom windows for almost any vehicle. Our 20 plus years of experience has included custom windows for a diverse range of products.
Pro Glass sells only preformed windows, manufactured from mar resistant LEXAN®.
and i found this on a RX7 board
CF hatch and lexan discusionThe Downside: Lexan Glass scratches very easily. Eventually this is going to hinder your view out the back.
and i read several places that as long as you treat it like your paint it will last a long time.
so lexan all the way baby