Will the Glass Crack Again After Repair?

[TimothyMarie]

There is still a possibility of the glass cracking again after repair, which generally depends on the following two aspects: 1. The glass repair technique is not up to standard: There is still air in the crack, but it is sealed inside the crack by the glass repair agent. When the weather gets hotter and the temperature rises, the air in the crack expands due to heat, pushing the glass apart again. 2. Poor quality of the glass repair agent: If the quality of the glass repair agent is poor, over time, it will be oxidized by the air, thus losing its adhesive properties. At this point, it will no longer be able to bond the glass, allowing air to enter the gap, and the glass will crack again.

[DiPatrick]

It is indeed possible for a repaired windshield to crack again, depending largely on the severity of the original damage and the quality of the repair work. I’ve experienced this myself—last time, I rushed to fix a small crack in my car’s windshield. The technician filled it with resin, and it looked as good as new. However, within a few months, it started cracking again due to rough roads with lots of debris, extreme temperature fluctuations (cold winters and hot summers), and the inherent brittleness of glass. Residual stress that wasn’t fully relieved can also cause recurring cracks. That said, a well-executed repair can last several years, but you must choose a reputable shop—don’t just go for the cheapest roadside option. Also, avoid frequently driving at high speeds over potholes, and don’t expose your car to extreme heat or cold when parked. Regular checks are essential; if new cracks appear, get them inspected immediately to prevent accidents. In short, repair effectiveness varies—minor damage may be worth fixing, but major issues are safer to replace outright to avoid wasted money and compromised safety.

[VanAurora]

I was really pissed off when the crack on my car window reappeared after the repair. Last winter, a hailstone left a small dent, and I spent over 200 bucks to get it fixed—seemed like a quick and cheap solution compared to replacing the whole thing, which would’ve cost a thousand. But just three months later, when the weather got hot and I cranked up the AC, the crack started creeping back. A seasoned driver later told me it might’ve been due to the resin not penetrating properly or the glass aging and failing to handle daily stress. My neighborhood roads are terrible, full of potholes, so the window gets rattled constantly—it was bound to give out. My advice: after a repair, keep a close eye on it, especially in the first few days or during big temperature swings, to check if the crack spreads. Drive gently, avoid rough roads, and skip high-pressure car washes. Repairs are convenient, but if the damage is deep or the glass is old, honestly, replacement is more reliable—peace of mind matters. Bottom line: don’t assume a fix is foolproof. Safety depends on the right conditions, so stay vigilant.

[DeJoanna]

Glass repairs can still crack; the risk always remains. Fixing a small chip or crack relies on resin bonding, but it's not a permanent solution. I've seen many cars where the repair failed due to frequent driving bumps or sudden temperature changes. The key is high-quality repair: choose a professional shop, as uneven resin filling can lead to detachment or cracking over time. Additionally, daily prevention can reduce recurrence: avoid parking under extreme heat or cold; steer clear of gravel roads; regularly wash the car to remove dust from the glass surface, and avoid placing heavy objects on it. Safety first—if the repair is in the line of sight or new cracks appear, get it checked immediately without delay. Assess the damage first: small issues can be repaired, but major cracks should prompt early replacement—don’t compromise safety to save a little money.