What is the significance of a paint's "sanding" requirement?

The significance of a paint's "sanding" requirement is primarily related to ensuring better adhesion for subsequent coats. When a surface is sanded, it creates a roughened texture that allows the new layer of paint to bond more effectively. This mechanical keying is crucial, particularly when applying multiple layers of paint or when working with glossy finishes, where adhesion might otherwise be compromised.

Sanding not only helps the next layer to adhere well, but it also removes any imperfections or dust that could mar the finish. Without proper sanding, the subsequent coats may peel or chip away easily over time, leading to a less durable and aesthetically pleasing finish. Therefore, the practice of sanding is a vital part of the preparation process in paint application, especially for achieving long-lasting results and ensuring that each coat adheres as intended.