Per I-CAR curriculum: "There are no clear guidelines for when a part should be masked or removed. When deciding whether to masking or remove a part, consider:

• the vehicle maker and paint maker warranties.
• part location.
• part access for removal or for masking. The design of a vehicle door handle, molding, or emblem may determine what should be done.
• if the parts or hardware are reusable. For example, some moldings, trim, and clips may require replacement if removed.
• the ability to properly sand the surface adjacent to the part. Proper sanding affects overall refinish material adhesion, either chemical or mechanical. A part that is difficult to sand around may also be difficult to clean and mask."