Vehicle Body Repair: Panel Assessment, Repair Methods and Finishing
Core concepts
Vehicle body repair starts with systematic damage assessment. A candidate must understand panel construction (mild steel, high-strength steel, aluminium, plastics and composites), how each material behaves under impact, and which repair method is approved for each. Learn the difference between a cosmetic repair and a structural one, the role of panel gaps and datum measurements, and how corrosion protection is restored after welding or sectioning. Understand the sequence: assess, strip, measure, repair or replace, protect, refinish, reassemble and verify.
Traps to watch
Questions often test whether you know that heat and straightening can alter the strength of high-strength steel, so manufacturer methods must be followed rather than generic panel-beating habits. Another common trap is treating filler as a structural repair, or forgetting that weld-through primer and cavity wax are mandatory after sectioning. Watch for wording that confuses "repair" with "replace" thresholds, and for answers that skip corrosion protection or panel-gap checks.
Rule of thumb
If a damaged area carries load, anchors a restraint or suspension component, or the manufacturer restricts heat, replace rather than straighten. For cosmetic dents, a useful rule is to repair only where the metal can be returned to contour without stretching, and always restore the protective coating on both sides of any weld.
Worked example
A door skin has a shallow crease with no intrusion bar damage. Assessment shows the inner frame is sound, so the skin is repaired, refinished and cavity-waxed, and the door is refitted with a gap check against the adjacent panels before sign-off.