What is a consequence of improper sanding of a repaired surface?

Improper sanding of a repaired surface can lead to poor paint adherence, which is a critical outcome to consider in painting and refinishing. When the surface is not sanded correctly, it may be too smooth, uneven, or contain irregularities, preventing the paint from forming a proper bond with the surface. Good sanding practices create a texture that allows the paint to grip effectively; without this, delamination and peeling can occur after the paint is applied.

In contrast, the other options suggest positive outcomes that are typically associated with proper sanding. For example, improving adhesion and creating a uniform surface are desirable results that come from proper surface preparation. Enhancing paint gloss is also a benefit of effective sanding, as a well-prepared surface allows the paint to lay down smoothly. However, these outcomes cannot be achieved if sanding is done improperly, highlighting why poor sanding leads to reduced paint adherence.