Repair or Replace? The Chip-Size Rules Techs Actually Use

The quarter rule

Chips up to about the size of a quarter are repair territory. Resin injection fills the break, bonds the laminate layers back together, and stops the damage from growing — roughly 30 minutes of work. Industry repair standards (the ROLAGS standard, if you want the document techs learn from) run slightly larger for some break types, but the quarter is the honest everyday line: bigger than that, and the structural math starts favoring replacement.

The six-inch rule

Cracks up to about six inches — call it dollar-bill length at the generous end for fresh, clean breaks — can often be stopped with resin: the tech relieves the crack tip, floods the length, and cures it. Past that, repair becomes cosmetic optimism. Long cracks flex with the body, pump moisture, and keep running; replacement is the honest recommendation, and a tech who says so early is saving you a wasted repair fee.

The edge rule

Damage that touches or originates at the edge of the glass is replacement territory almost regardless of size. The perimeter is where the windshield carries its structural load into the frame, stress concentrates there, and edge cracks resume running through repairs with depressing reliability.

The sightline rule

Even a perfectly repairable chip gets a second look when it sits directly in the driver’s view. Repairs leave a faint blemish — a small optical scar — and a scar at eye level can refract oncoming headlights all night, every night. Many licensed techs decline sightline repairs on safety grounds and recommend replacement; several states’ inspection rules effectively agree.

The layer rule

A windshield is two glass layers laminated around plastic. Damage confined to the outer layer repairs; damage you can feel from the inside, or that penetrated to the inner layer, replaces. The fingernail test from the cabin side is the quick check — if the inside surface catches, the conversation is over.

What the rules mean for your wallet

Every rule points the same direction: the week a chip happens, you hold all the good options — quick repair, preserved factory seal, often zero cost through insurance (repairs are frequently deductible-free, and Kentucky and Florida waive glass deductibles by law). A season later, the same stone strike has usually graduated to replacement, cure times, and camera recalibration. The rules are not complicated; the calendar is the whole game. A licensed tech looking at a photo of your damage can apply all five rules in about a minute — which is exactly the free phone call we exist to connect.

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