Identify whether a visible line is dirt, a clear-coat edge, basecoat exposure, or a color mismatch before trying to feather it away.
Do not assume automotive spot putty can be wet sanded. Identify its chemistry, follow its sanding directions, and let the next primer set the final scratch.
Map bare plastic, repair material, primer, and paint before sanding a bumper. Let each layer's maker and the next coating decide whether water is allowed.
Screen the headlight for external, repairable haze, then use one compatible sanding, polishing, and protective-coating system from start to finish.
Identify the automotive coating layer and decide whether the next step is polishing or recoating before wet sanding. Use a bounded test and inspect dry.
Wet sanding is not an automatic body-filler step. Identify the product, follow its technical sheet, and add water only when the maker permits it.
Determine whether an exact automotive primer permits wet sanding, then control grade, water exposure, dry inspection, and the topcoat window.
Decide whether post-spray orange peel is safely levelable or signals a film, cure, or application problem that needs preparation and re-shooting.
Confirm that the defect is in a sandable clear coat, not within the laminate or under a film. Protect edges and ridges and establish the complete sand-and-polish...