With regard to Lexan, Select Plastics in their FAQs Select Plastics, LLC
states that neither they nor Lewmar recommend Lexan (polycarbonate) and prefer acrylic. While Lexan is stronger it yellows and degrades at such a rapid rate its life could be half that of acrylic. Additionally Lexan scratches easier than acrylic unless it has a special (extra cost) laminate which is subject to delamination. BTW they will sell you either Lexan or acrylic or several other plastics.