Exterior Body and Panel Damage Assessment
Reading panel damage
Exterior assessment requires understanding how a panel deforms and what restores it. Know direct damage (impact area) versus induced damage (stress transferred to adjacent panels, gaps, and mounts). Know elastic vs. plastic deformation: mild steel and aluminum behave differently, and high-strength steels may be non-repairable per manufacturer procedures. Understand gap and flush checks, body line continuity, and crease location as repair/replace signals.
Repair methods and limits
Know common operations: pulling, hammer and dolly, stud welding, panel bonding, and sectioning where permitted. Understand that aluminum requires dedicated tools, isolation, and often rivet-bonding. Understand corrosion protection and seam sealer restoration after repair. Understand blend panels and why adjacent panels are refinished to match.
Traps
A classic trap is assuming a panel with a crease at a character line is repairable - often it is not, or repair costs exceed replacement. Another is ignoring induced damage because the gap "looks fine." Also watch for questions that treat aluminum like steel, or that skip refinish blend on adjacent panels.
Worked example / rule of thumb
Rule of thumb: if the crease crosses a body line or the panel is high-strength steel, evaluate replacement first. Example: front fender with a sharp crease at the wheel arch - repair may distort the arch and require excessive filler; replacement with R&I and refinish plus blend to the hood edge is often the correct call.