Windscreen Crack Repair and GTechniq G1 Windscreen Coating Application

A brief look at the process of a windscreen crack repair as well as the application and result of GTechniq G2, a water repellent coating for glass.

My job for this car was to coat the windscreen with GTechniq G2, but the owner wanted to fix a crack first, so I called the crack repair specialist in and took some photos of his process.

Here are some not-so-clear pictures of the crack.

He first started using a small drill which I guess is to create a cavity to let the resin fill in better later on.

He poured some resin in to the metal spider looking thing which is called an injector. This injects the crack with resin and is cured with UV light from the other side first.

He then placed some resin on the outside and what seems to be like a square piece of plastic.

Total curing time was about 25 minutes. Finally, the square piece of plastic was removed, the excess hardened resin is then scraped off with a razor blade at 90 degrees, and this won’t scratch the glass. The rest is then polished off with some polish and a cloth.

Leaving us with this, unnoticeable from afar and only barely visible when viewed up close or from an angle.

With the crack repair done, I then started my GTechniq G1 application by washing the windscreen first.
As you can see, there seems to be some water repellency present on the windscreen, although it is not very strong.

Glass is washed with some Osren shampoo, rinsed and dried. Surrounding areas were taped off since the paintwork has PPS coating on it and I do not want to accidentally remove it with my glass compound. All glasswork is then cleansed with Soft99 Glass Z Compound on a Lake Country 4″ Orange CCS cutting pad via Dodo Juice Das6 Dual-Action polisher.

When the glass is dry, GTechniq G1 is applied with a cotton pad. 4 coats on the front and back, and 2 coats on the sides and wing mirrors. Usually the rear glass only needs 1-2 coats, but this car had rear wipers and wiper abrasion is the main cause of decreasing the durability of a glass coating.

G1 residue is removed with IPA (diluted 1:1) and the hydrophobic effects were marvelous. Wiper blades were coated with a carbon-based friction reducer to reduce wiper chatter.

Before handing the car back to the owner, I gave the car a wash and a quick coating with Gtechniq C2 on the bodywork and wheels.

Thanks for looking and spending your time here on my blog!

P.S Does anyone know anything about glass crack repairs? I plan on learning this as it seems pretty easy to do as I was watching the technician do it. It’s on my list of things to learn, others include applying paint protection films, basics of painting and paintless dent removal. If only this I can do this full time…if only…