Vehicle’s Windshield Stress Crack: Definition, prevention & repair

Windshield stress crack on vehicles has always been an unwanted phenomenon especially in areas where we have a very high temperature like Africa. In my article of today, I shall be talking about the avoidable but difficult to repair stress crack. To understand this very well, i will list some types of crack that can affect your vehicle’s windshield. Unfortunately, other types of cracks might be unavoidable but stress cracks are 100% avoidable. Suffice to say it that, stress cracks are also more common than other types. Other types of cracks include:

stress crack in NigeriaBull’s eye/Half moon
Circular ding, with a cone in the outer layer of glass. A half moon crack is similar, but not completely circular.

Damage by a rock that causes a small piece of glass to break off the windshield.

Floater crack
Less common than an edge crack is the floater crack, which is caused by severe temperature changes (especially cold temperatures) to stone breaks.

Must Read: DIY Car problems diagnosis tool



In a layman’s language, I will describe a stress crack as a crack that occurred IN your vehicle A crack that occurs without anything actually hitting the windshield.Stress cracks will normally be a straight (or slightly bending) line, and will not have any sign of impact. A “pen test” is often used to determine if there is a stress crack — a ballpoint pen is run along the crack, and if it dips anywhere, it is not a stress crack. A wide range of temperatures has a very direct effect on a chipped windshield. The metal in the frame of your car or truck can expand and contract at a different rate than the windshield glass. This places stress on the windshield frame, which cracks the glass further That is because, with a stress crack, no glass actually comes off the windshield. Let me post at least two pictures of what a stress crack looks like


stress crack in Nigeriawindscesreen crash without reasonimages






  1. The most common causes are a large variation in temperature, like if your car has been sitting in the hot sun all day and then you blast the AC.
  2. Still on large variations in temperature; If your car will be parked in the sun for hours, please make sure you wind down the windows a bit(note: With relations to Nigeria situation do not wind it all the way down so that pilferers won’t take advantage of this and make sure nothing valuable is forgotten inside the car. It will be a best practice if you park it where there are people who can help you watch over it). By doing this, you are preventing hot air from been trapped inside of the car.
  3. Another cause is; when a car becomes overheated from sitting in the sun, and you now start washing the car with cold water. this will eventually result in stress crack and damage to your paint job. Please warn those who wash your car about this. The car must cool off before washing. Do not wash in direct sunlight for whatever reasons.
  4. The opposite example would be a very cold car suddenly being exposed to heat. This is why, in the winter, ice should be scraped or melted off the windshield with cold water, but never with warm or hot water



The answer is yes and no. If the mark /crack is not more than 6 inches long, it is repairable but if it is larger, it is not a candidate for repair.

Stress cracks typically start from the edge of the windshield, and they can quickly become quite large. These two factors combine, making most stress cracks irreparable. In general, if a windshield crack emanates from the edge of the windshield (as is common with stress cracks), is in the driver’s line of vision, exceeds a certain length, or is contaminated with debris, the crack is not a candidate for repair.

The windshield repair process involves drilling into a crack and filling it with a resin that hardens within the crack. The goal is to stabilize the crack and prevent it from spreading. This is similar to having a dentist fill a cavity in your tooth. However, even if a crack is not in the driver’s line of vision, if it’s near the edge of the glass, it may not be repairable because suction device used to repair cracks needs sufficient space and a good seal. In a situation that i witnessed(you can confirm this from my pictures above) local glass cutters tried to stop the crack, but they ended up making it worsen. so please be warned, stress crack are difficult to repair when nt detected early enough.


  •    If you can, park your car in a garage or other temperature-controlled environment(I mean a shaded garage). Leaving your car out in the sun or in the cold tends to make the edges of the glass more brittle.
  • If you notice a crack or ding in your windshield, have it looked at immediately! The longer you wait, the more damage you are in for
  • If you cannot help but park your can in the hot sun all day, please wind the windows down a bit to allow free passage of hot air.
  • Do not wash your car in a direct sunlight and do not wash your car immediately after leaving the sun
  • Another sure method is for you to buy a car sunshade or a multipurpose car cover(not the polyethene car cover bein sold in our Nigeria market)  I mean a real car umbrella that will shut out the sun, snow, dust and rain without resulting in any damage to your paint job or windshield. See some examples below:




YITAMOTOR 8 Layers 3XL Car Cover Aluminum Outdoor Seamless Waterproof Rain Sun UV Dust Wind Resistant







car sun shade

windows car shade

Car Windshield Sunshade Jumbo (63″ x 35″) for Car Truck SUV Minivan – UV Protector Shields Auto & Keeps Vehicle Cooler






NOTE: Original car covers are more expensive than car shades but it is nothing compare to the wonder job that it does. As for car sunshIdes, i can authoritatively say you can get them easily in auto shops. You are not advised to use sunshades alone as it tends to protect more of the interior than the exterior. when you are using the sunshade, you still need to wind down your window a bit.  As for car cover, you can use it alone as a full-time protection against UV rays, dust, sun and rain. If you are the patient type and you need help buy a car cover for your vehicle, I can help you order one. If you know this article is an eye opener, please share it.


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