Why Avoid Drilling Your Windshield Repairs?


Thanks for being with us again for another video blog from GlasWeld.

Today’s topic is drilling in windshield repair, is it really necessary?

To start off we wanted to talk a little about the history of drilling. Drilling got started in the mid 70s back when windshield repair was in its infancy. The main idea behind it was to help open up the break for the resin to flow in. Primarily, this was important because the technology was only available to use what’s called a screw thread style injector. You’re really just forcing the resin in and hoping the air and moisture come out on their own. Of course, drilling really helped to get the resin in with that type of technology. But as we all know it’s not 1975 anymore, the windshield repair technology has really come a long way, to the point that now we have extremely strong vacuums and technology that allows us to hold the vacuum while forcing resin in. So drilling is really no longer necessary due to the advancement of the windshield repair techniques and products.

The other factor to consider when deciding whether to drill or not is cost. Of course, drill bits are not real expensive, but the cost can add up if drilling when it’s unnecessary. So why drill if you don’t have to. The other thing to consider is the inherent risk of drilling.

When you drill, it’s very easy for the drill to scoot across the glass, causing a little scratch on the glass. It’s also easy for the vibration of the drill to cause a little leg to spread during the repair process. The other possibility is drilling too deep and contacting the polyvinyl butyral or PVB, the plastic layer in-between the two sheets of glass. If you do that, then you have also compromised the structural integrity of the windshield.

The other factor in deciding when to drill or not, is the quality and visibility of the final repair. We all want a great repair and as we know if you’ve done a great repair, what is really visible at the end is the impact point. By drilling, we tend to make the impact point more visible to the human eye. But you might ask what are some alternative techniques we can use to drilling. Probably the most important technique to learn is to use a fixed tip probe before you start any repair to thoroughly clean out the impact point first. And secondly to probe the entire break before starting, to help open up any channels of the break that might be sort of closed up. This will ensure that once you put your injector on the break that the resin will flow more readily without requiring drilling.

Thanks for being with us again for another video blog with GlasWeld. Look forward to seeing you next time!

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