Tag Archives: Maintenance repair and operations

Hot Weather & Windshield Repair

 

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Glass will always behave in a relatively predictable way. There are a few “enemies” of windshield repair. Extreme temperatures is one of them. Glass tends to expand in the heat and contract in the cold. The windshield is comprised of three layers, UV glass on the outside, UV glass in the interior of the car and a synthetic in the middle, laminated together to create a strong bond. When it is very hot outside, especially when the car has been sitting in direct sun, the windshield can heat up to well over 110 degrees F. More than likely, drivers will run their car air conditioner on a hot day and if there is a rock chip or a small crack on the windshield, the variance in the temperatures from the outside of the windshield and inside the car, can easily cause the damage to ¬†grow in size resulting in the need for a costly windshield replacement. Here’s why: The outer layer of glass is expanding in the heat. The middle layer is fixed, and the inside layer is contracting from the cold air blowing from the air conditioner. This causes a certain amount of pressure, and to relieve the tension, the glass cracks. It is the same principle that cause a hot glass to shatter if it is held under cold water or visa versa. In the Winter, the same thing can happen, only in reverse. The outer layer of the windshield is icy cold and when the car heater is turned up, the inside layer begins expanding with the heat.

The take away from this, aside from having your windshield repaired asap when you have a rock chip, is:

  1. Avoid extremes in temperature. If you are still using the vehicle before you have a chance to have it repaired, try to park it in a shaded area, out of direct sunlight.
  2. Avoid using sun reflectors that are shiny. Shiny reflectors will shield the interior of the car by reflecting sunlight away, but they are also known to heat the windshield to temperatures that can easily cause a small rock chip to spread. Instead, use opaque, or satin-finished sun guards.
  3. If you are using your air conditioner, keep it on low, and keep the setting adjusted so that the air flow is focused mainly on your legs and not on the windshield.

-Simple tips that can help to save your windshield.

Water and Resin Do Not Mix

Wet WindshieldWhen a rock or some other type of debris hits your windshield, it leaves an open hole exposing the soft PVB layer of your windshield, which is laminated between the outer and inner layers of glass. This leaves the damaged area exposed to the elements where dirt debris and moisture can accumulate in the damaged area. The windshield repair process uses an acrylic resin which is injected into the damaged area under significant pressure. The resin used does not mix with water. Repairs made with water present will result in a cloudy appearance and will not be as structurally secure as one made where no water is present. Technicians can use a dying tool in an attempt to dry out some of the moisture before proceeding with the repair. However, glass tends to expand with heat so there is a greater risk of the windshield cracking out when a drying tool is used. The best course of action is to put a small piece of adhesive tape directly over the damaged area immediately after the damage occurs and then schedule a repair appointment. The result of taking immediate action will be a much clearer repair with the windshield restored to 100% pre-damaged condition.

 

Star Repair Before & After

 

Its hard to see from the photo on the left side that in addition to a common star break, there was a piece of glass about 1/8th of an inch thick by 1/2″ round, missing. It had been sheared off when the rock hit the windshield. The customer was pleasantly surprised when there repair was completed. There was almost no trace of the damage. We let the pit resin cure for a little longer than usual since the damage was deeper than usual.