To prevent the finish from being ruined, what should be avoided during the application of finishing materials?

During the application of finishing materials, preventing cross-contamination is critical to maintaining the integrity of the finish. Cross-contamination occurs when unwanted substances from one material, such as dust, debris, or residues from other finishes or solvents, mix with the finish being applied. This can lead to a variety of issues, including uneven application, bubbling, or an overall compromised finish that won't adhere properly or cure as intended.

By avoiding cross-contamination, you help ensure that the finish adheres correctly to the surface and cures evenly, resulting in a smoother application and a more durable final product. Each of the other choices can lead to specific issues as well; for instance, applying too many coats can result in a thick, uneven application, using different brands may lead to incompatibility in finishes, and burnishing can create too much gloss when not intended. However, cross-contamination poses a fundamental risk to the application process, potentially ruining the entire project.