JohnR66 wrote:

Lexan is a trade name for polycarbonate plastic. Plexiglas is a trade name
for acrylic plastic. Which do you have?

Assuming acrylic:
The best blade is a triple chip, alternating profile tooth with 80 carbide
teeth on a 10" blade. Rake should not exceed 5 Deg. These are typically a
special order item and cost around $100 or more.

Building a shed. $100 blade for a couple or three windows? Cost more
than the windows probably.

Getting a Terry-Fletcher plastic scoring tool is better for smaller
projects. They cost around $6 and last long. Avoid those cheap plastic
cutters with the swing open blade. You can avoid any cutting work by asking
a hardware store or a picture framing business to cut it for you. They
likely have a machine to cut it for you.

I wasn't recommending a particular brand or style of cutter, just
pointing out the difference between a dedicated plastic scoring tool as
opposed to cutting it with a utility knife. I'll remember the
Terry-Fletcher brand name for future reference. Thanks.

I don't recommend screwing it to the window frame. plastic expands and
contracts with varying temperatures so it needs room to move. It is much
better to mount it in a channel system allowing 1/32" per foot for
expansion. Also, screws cause high stress points that detracts from the
material's high impact strength.

In other words, it will probably crack at those screw holes. Thanks
for clarifying, John.

R