Will the polycarbonate yellow over time?

No, the polycarbonate is manufactured with a UV inhibitor to prevent yellowing.

Our manufacturer, Galina USA (Janesville WI), has non-prorated 10 year warranty. At year 10 you will receive 100% value if there is an issue. The polycarbonate is made to our stringent specifications. No other company requests the specifications we require in our 6mm or 16 mm Polycarbonates.