Diagnose cross-grain scratches in wood, make the smallest safe grit backstep, and rebuild a with-grain sanding pattern without dishing the face.
Diagnose edge lines, halos, ridges, and cut-through, then choose supported or flexible backing to blend the defect without rounding the intended shape.
Classify sanding haze as a uniform refinement pattern, rogue scratches, residue, or material damage before making the smallest justified grit correction.
Restore an over-sanded edge by recutting, rebuilding, edging, or replacing it first, then use a firm reference block to refine the repaired geometry.
Identify the polycarbonate grade, coating, and safety role first; use maker-approved polishing or controlled coupon testing only when the exact part permits it.
Diagnose pigtail scratches revealed by stain by reading their shape and distribution before stripping or sanding the entire surface.
Keep UHMW cool, use a fresh light-cut abrasive on firm support, and treat scuffing as texture control rather than a guaranteed bonding treatment.
Confirm whether the floor is solid, veneered, or synthetic; work along the planks with a flat support and remove dark dust before it enters pale lines.
Map changing grain directions across triangular stair winders, machine the broad zones, then hand-finish each board along its own grain.