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September/October 2002

Tech Tips
    helpful hints

Ask the Doctor
by Walt Gorman

Q: I often have an otherwise excellent repair marred by a burn mark in the glass where I have drilled. Is there any way to remove this?

Prevention is the only way that I know to remedy this problem. Use a high-torque, low-speed drill with a sharp bit. Drill in two-second bursts with two-second intervals between the bursts. This will keep the glass from overheating and scorching.

Q: How do I prevent “halos” from forming around bull’s-eye repairs?

This most likely will occur in hot weather when the laminate is hot. Use a thick resin and avoid excessive pressure. The halo is the result of resin being forced between the glass and the laminate.

Q: An insurance agent in my area is under the impression that repairs on the driver’s side of the windshield may not be repaired legally. A network shop told him this. What are the regulations regarding repairs on the driver’s side?

This is utterly false. The Recommended Practices Committee of the National Windshield Repair Association has recommended that repairs in the “acute area” be limited to the size of a quarter, with a pit no larger than 3/6 inches, and that no long cracks be repaired in this area. The acute area is defined as an area 8 ˝ inches across by 11 inches down in front of the driver (not the whole driver’s side).

Q: Is it possible to blow moisture out of breaks with compressed air?

 The problem with this is that compressed air itself contains moisture. You can buy it without moisture, but it is so much easier and cheaper to use a 12-volt electric moisture dryer. Several windshield supply companies sell excellent units.

Walt Gorman is the owner and founder of A-1 Windshield Doctor in Seekonk, Mass. He has 15 years experience in windshield repair and runs a training school for technicians. E-mail your questions to




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