Originally Posted by TJM
Standard "Lexan" (polycarbonate) is not UV stable and will crack and craze in a years time outside.
Acrylic is the best material for windscreens. It can also be purchased in colors. Acrylic is not as strong as Lexan though. Always chamfer your holes and allow for thermal expansion between fasteners.
Up here where the sun only shines 5 days a year it is the material of choice. Mine is now at least 20 yrs in and looks great.
The original on many 70s and 80s trawlers turned blue or purple within a few years. Mine was 14 yrs old when I bought the boat and I broke a piece of it by dropping the bimini frame onto it. That is when I found out that it had been "bronze" colour when new. My now sr. aged lexan is still "bronze" and clear. The only crazing is very slight, and right along the edges. It has many years left in it.