What should be the first step before refinishing a repaired area?

Before refinishing a repaired area, it is crucial to ensure that all surface contaminants are removed and the surfaces are properly sanded. This step is essential because any dirt, grease, or other contaminants can lead to poor adhesion of the paint and ultimately affect the quality of the finish. Proper sanding also helps to create a smooth and even surface, which is vital for achieving a professional appearance and ensuring that the paint adheres correctly.

Sanding prepares the surface by removing old paint or imperfections, thus allowing the new paint to bond effectively. If this step is neglected, it can lead to peeling, bubbling, or an uneven appearance in the final coat of paint. Thus, preparing the surface by cleaning and sanding is foundational to a successful refinishing process.