History of Encore Plastics Corporation Encore Plastics is a division of Encore Industries， Inc. Encore was established in 1987 in Pittsburgh， Pennsylvania. The company was relocated to Sandusky， Ohio in 1993 and the current management assumed control of the operation in 1997. Over the years， Encore has extended its product range to include everything the painter and the do-it-yourselfer could want， from paint trays and liners to buckets， pails， caulking guns， kits and accessories.