When should soft wet sanding pads not be used?

Soft wet sanding pads should not be used when attempting to create a level finish after a repair because they may not provide the necessary firmness and flatness required for leveling. Leveling a surface often requires a more abrasive or harder sanding tool to ensure that imperfections, such as runs, drips, or uneven patches, are effectively removed. Soft pads can conform to the surface irregularities, which could prevent achieving the desired flatness and smoothness.

In contrast, using soft pads might be beneficial when working gently on delicate or uneven surfaces, but not when a precise, flat finish is critical post-repair. This is particularly important in automotive refinishing, where a flawless appearance is essential for aesthetics and quality of the finished paint job.