Before applying a new coat of paint, what surface preparation is essential?

Surface preparation is a critical step in achieving a high-quality paint finish. Cleaning the surface removes dirt, grease, and old paint particles that can prevent the new paint from adhering properly. This step ensures a smooth, clean surface for the paint to bond to, which is crucial for durability and longevity.

Repairing any imperfections such as cracks, holes, or peeling paint is equally important. If these issues are not addressed, they can lead to further deterioration and affect the overall appearance of the painted surface. By fixing them, you create a solid base that helps the new coating look uniform and professional.

Priming is another essential part of preparation, especially when painting over a different color, a porous surface, or when the surface may bleed through, such as with wood or stains. A primer helps to create a barrier, enhances adhesion, and improves the overall color and finish of the paint.

The other options, while they might contain relevant elements, do not encompass the complete and necessary steps for effective surface preparation. For example, while sanding can be helpful for certain surfaces, it is not universally required and does not address the need for cleaning and priming. Similarly, thinning paint may ease application but does not contribute to good surface adhesion and preparation. Thus, cleaning