About Dip Seal Plastics, Inc Incorporated in 1949, Dip Seal Plastics, Inc has been a family owned business for more than 60 years. Our staff takes pride in their ability to come up with solutions for a customer's problem. Our technical and customer service are world class. Or mission is always to look for better ways to provide you the best in quality and service, while continuing to provide the most effective thermal plastic protective and decorative coating possible.