[cashman]

btw2; Paradoxically, Windex says that their (ammonia) product is fine for PC.

The ad does not mention PC? It mentions Lucite =Acrylic, Plexiglas, and Plastic = ?. It does not specifically mention PC.

Either way, PC is an amorphous plastic highly susceptible to chemical and oil attack. Ammonia is one of the chemicals. Also, the PC you purchase for window glazing is not "stress free", it is produced by squeezing hot melted PC between
(2) polished calandar rollers and it hardens quickly on-line. Stress free PC has to go through and annealing process and it does not for this product. You can purchase machine grade PC which has been annealed but that is usually 5/8" and thicker and you should only use water as a machining coolant.

The flat surface of the PC forms a skin while extruding and will offer some protection for the quick spray but you really have to be careful about the cleaner getting to the exposed cut edge.

You are correct, UV sunlight will eventually start to yellow the PC. I believe it comes with a 10 yr warranty against yellowing.

Long story short, if you are going through the process of hand cutting windows. I would suggest using Abrasion resistant PC. The hard coat will allow you get away with the incidental paper towel and Windex use and also also provide some minor scratch resistants.

Sorry for the long response,
Mark