For which type of finish should you avoid using plastic wraps?

The rationale for avoiding plastic wraps with natural finishes lies in the way these finishes cure and interact with moisture. Natural finishes, which include oils like linseed oil or tung oil, typically rely on exposure to air to cure properly. When a plastic wrap is applied, it can create a sealed environment that traps moisture and limits airflow. This can lead to issues such as incomplete curing, a sticky surface, or even mold growth.

In contrast, water-based, oil-based, and shellac finishes might have different curing processes and are less likely to be adversely affected by the short-term use of plastic wraps. Water-based finishes can often tolerate some level of moisture since they are designed to resist it once dry. Oil-based finishes, while needing oxygen to cure, may sometimes be wrapped or covered with other materials for a limited time if there is careful consideration of moisture management. Shellac is usually quick-drying and can handle a range of conditions without adverse effects like natural oils.

Therefore, choosing to avoid plastic wraps specifically with natural finishes is crucial to maintain the integrity and desired outcome of the finish application.