installing a plexiglass window

[JMPE]

Chixpix is right. I always use Lexan (which is what is commonly available in all of the building supply stores around here) because it is far superior to Plexi in that respect. I use the term Plexiglas like I use the term Kleenex instead of facial tissue. There is is difference. Lexan will weather far better (it is commonly used in skylights and other "real" places).

 

[ChixPix]

Lexan is pretty expensive tho! We used to only sell it by a full sheet.

you could also go with a laminated glass. It's not too expensive, and a flat glass shop would probably sell you a little piece for next to nothing. Laminated has 2 pieces of glass with plastic sandwiched in between. It will be tinted to green lightly - it's what your car windshield is made of. You will find it nearly impossible to break all the way through.