Confirm solid bronze versus plated or coated metal, establish one directional scratch standard, then protect it with a tested wax.
Identify plating and porosity first, then use short cool cutting passes that preserve edges and reveal when repair is no longer cosmetic.
Extend the blend beyond the repair and use a physical direction guide so the new grain does not stop as a visible patch.
Control abrasive freshness, lubrication, pressure, and dwell so titanium cuts cleanly instead of smearing or overheating.
Choose the tool by edge length and access, then prove the brittle oxide is gone without rounding the cut geometry.
Use reference panels, fixed stroke direction, and blend boundaries to hide repair scratches without creating wandering grain.
Control pressure, temperature, direction, and panel support so cosmetic refinement does not dish or distort thin aluminum skin.