Polishing may enhance the appearance of the product. This is the most common requirement in plastic molding. It should be noted, however, that the appearance  often is required for visible outside only. Often, no polish is required on the seen inside of the product, and the finish there need not to be better than that required for easy ejection of the product from the mold. For clear plastic products where the inside finish will affect the appearance of the outside, the inside must have the same finish as the outside of the product.