Suitable thermoplastic resins are those with high clarity and include, for example, polyalkyl and aralkyl methacrylate polymers such as polymethyl methacrylate and methacrylate copolymers, polymethyl methacrylate/alkyl acrylate copolymers, styrenic polymers such as polystyrene, polyalkylstyrenes and styrenic copolymers such as styrene-acrylonitrile copolymers, styrene-acrylonitrile-methyl methacry