POLY 6-MIL CLEAR 20' x 100'. Greenwald polyethylene sheet is a tough film used for various applications. It is produced in various sizes and thicknesses. Its durable material with multipurpose properties is weather and wrinkle resistant and can be reused countless times in different applications. Its roller, for being practical, offers protection against dust, paint splashes and wind. Furthermore, it works in hot and cold temperatures and shows stability in outdoor applications.