Poly America L P 22400495 Husky 4 Mil Black Poly Film 10'x100' Polyethylene film is used for many different construction and DIY purposes. 4 mil thick plastic sheeting is generally referred to as heavy duty. Some common applications for this product include using it to winterize windows, as a cover for outdoor protection, or even as a paint drop cloth on floors. 1000 Sq. Ft. 4 Mil Thick Black Plastic Sheeting