Instead of a combination of plastic and paper, we recommend premium masking film as it easily pays for itself in masking time and reduced rework. Reusable, untreated plastic and paper sheeting from around the shop will normally have dirt or dust particles on it and can easily introduce those contaminants to the paint job. It also does not prevent dried paint from flaking off and contaminating the fresh paint job upon removal. You can counter this by using smaller pieces of masking paper along with the sheeting, but that can be time consuming.
Premium automotive masking films such as 3M™ Purple Premium Plus Masking Film go through a chemical process called a corona treatment. This changes the surface chemistry of the film, helping paint adhere to it and preventing flaking. You can also tape directly to the masking film instead of using it in conjunction with masking paper, which saves time and material.