A Plain-English Dent Repair Glossary

Paintless dent repair (PDR) — removing a dent by working the metal back to its original shape rather than filling and repainting over it. The factory finish is never disturbed, which is the entire point. Covered in full on our paintless dent repair page.

Glue pulling — pulling a dent from the outside of the panel using a tab glued to the paint, then released. It is the technique of choice when there is no access behind the panel, and in professional hands it is only half the repair: the pull is paired with knockdown work and constant reading of the surface.

Knockdown — tapping down the high spots created by pulling or pushing. Metal moved back toward its original shape overshoots in places, and knockdown work brings those highs level. A repair that stops before this stage looks better than it did but is not finished.

Light board — the striped or lined reflector a technician positions over a panel to read damage. The reflection bends wherever metal is no longer flat, which turns an invisible contour into something measurable. It is why a good estimate photo is taken at an angle rather than straight on.

Access and leverage — whether the technician can physically reach the back of the dent, and at what angle. This drives price more than dent size does: a small dent behind a brace or inside a sealed cavity can cost far more than a larger dent in open metal. Our cost guide explains the economics.

Body line — the styled crease or ridge pressed into a panel at the factory. Metal is stiffer along a body line and behaves differently there, so a dent crossing one is a materially harder repair than the same dent in flat metal.

Crown — the gentle outward curve of a panel. Metal with more crown holds its shape more stubbornly and resists being pushed; flat, low-crown panels move more easily but also distort more easily.

Work-hardening — metal becoming harder as it is worked. Aluminum does this noticeably, which means the tenth push on a spot meets harder metal than the first, and the repair has to be planned so the metal is moved as few times as possible. See aluminum dent repair.

Oil canning — a panel that flexes between two stable positions, popping in and out under light pressure like the bottom of an oil can. It signals metal that has been stretched or badly worked rather than simply dented.

Sound deadening — the adhesive pads and foam bonded to the back of panels for noise control. It matters because it sits exactly where a technician needs access, and it changes how heat and pressure travel through the metal.

Bedside — the outer side panel of a pickup truck bed. Heavier gauge than a car door because, as Travis puts it, "it's made to work" — which means it takes more force to move and holds its shape more stubbornly on the way back.

"Pickle" or "oatmeal" — technician slang for the rippled, dimpled surface a panel takes on after being pushed too hard and too fast: a field of small highs and lows instead of a smooth contour. Travis's own description of a botched repair is "It looks like pickle. Or oatmeal." Our guide on how to spot a bad dent repair covers what can still be saved.

Clear coat — the transparent top layer of a modern paint system, and the layer that decides whether PDR is possible. If it cracked, shape can still be corrected but the finish cannot, and the panel needs a body shop.

Factory finish — the paint applied and cured at the factory, under conditions no aftermarket shop can reproduce. Preserving it is the reason PDR exists and the reason it protects resale value.

Blend panel — a neighbouring panel that gets repainted purely so the new color transitions invisibly from the repaired one. It is why a single door dent commonly results in three repainted panels rather than one, as covered in PDR vs a traditional body shop.

Diminished value — the loss in a vehicle's worth caused by having been damaged and repainted, recognized as a concept in the insurance world. Whether you can recover it depends on your state, your policy, and fault. See insurance claim assistance.

Comprehensive claim — the coverage that handles hail, falling objects, and other non-collision damage. It is the route most hail repairs take, and it typically does not affect your rate the way an at-fault collision claim can.

Paint-depth gauge — a handheld tool that measures finish thickness in seconds. Any serious dealer or informed buyer can own one, and it is how a repainted panel gets identified at trade-in no matter how good the respray was.