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August 3, 2011

18

Windscreen Crack Repair and GTechniq G1 Windscreen Coating Application

by Kenneth Tang

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.

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

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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.

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

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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.

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

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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.

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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.

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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.

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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.

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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.

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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…

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18 Comments Post a comment
  1. CK
    Aug 3 2011

    Eh.. how much would you charge to do the windscreen only? My car is really bad need of “repairs”.

    Reply
    • Aug 3 2011

      Hi Izso…what do you mean by repairs? 😛
      Front screen rm200+, this is for coating application only… crack repair normally costs about rm100 per crack.

      Reply
      • Izso
        Aug 3 2011

        Erm.. Repairs because of the horrid water marks et all. So RM200 to clean the windscreen? I need to clean it the way you did for this VW. Please quote me for all 4 sides.

        Oh btw, I’ll have a VW Beetle for you to clean in Oct. Need it prepped for a wedding

  2. Izso
    Aug 3 2011

    Dammit. Why did it show up as CK?

    Reply
  3. Aug 3 2011

    Nice write-up, as always!

    What’s this carbon-based friction you’re talking about?

    Reply
    • Aug 3 2011

      Thanks Toni! It’s a liquid that is applied on the rubber blades of the wiper. Water repellant coatings behave as such because it creates many tiny ‘peaks’ on the surface of the glass, causing water to bead and roll off. This also makes the glass more ‘rough’ and wipers are more prone to juddering/chatter, so this liquid apparently has carbon in it and makes wiping smoother by reducing the friction between the glass and the rubber blade, the compromise is that it will reduce the durability of the coating a little.

      Reply
  4. Aug 18 2011

    What kind of camera are you using? I really like your water beading shots!

    Reply
    • Aug 18 2011

      Hi Anson, I’m using a Canon 60D, some shots are shot with a f/1.8 50mm prime lens.

      Reply
  5. Eric Yee
    Nov 12 2011

    Ken,

    Where can I buy the carbon liquid for wiper blades treatment in JB?

    TQ

    Eric

    Reply
    • Nov 28 2011

      Hi Eric,

      I don’t think they are for sale to end users. You can check if there are any centre that uses Rainaway products, they might have the wiper coating.

      Reply
    • Dec 6 2011

      Hi Eric,

      I don’t think they are available for sale.

      TQ.

      Reply
  6. kenny ho
    Dec 15 2011

    hi , im kenny . where can i get this marvelous GTechniq G2 ? any contact pls ?

    Reply
    • Dec 28 2011

      http://www.gtechniq.co.uk

      Reply
  7. Jan 3 2012

    hi. i’m David, currently running a car detailing centre in Seremban.

    i’m using Meguiar’s product to polish, and for windscreen is using rainaway product.

    now searching windscreen repair product to complete my services. can you advice me which product you are using and where to get the repair tools.

    best regard
    David
    016 355 1326

    Reply
    • Jan 5 2012

      Hi David,

      Thanks for dropping by my site! Actually the windscreen crack repair is not done by me and is done by another technician, I am just sharing his work to show others the process of a crack repair. I don’t know where to get the tools and how to do it. Sorry I can’t help much. Maybe you can try asking those shops that do windscreen repairs. Thanks.

      Reply
  8. khalid
    Apr 5 2012

    hi kenneth, how long does the water repellent coating will last ? and how much is it ? thanks !

    Reply
  9. Aug 17 2012

    $author awesome blog

    Reply
  10. satish
    Aug 17 2012

    hi,
    Our Nano Glass Sealant PROKLEAR is a German product.
    It is Anti-Glare and Anti Rain.
    It lasts long.
    We are currently bundling with a Precleaner / Glass Scratch Remover.

    We would be happy to provide our product for your review.
    Kindly let us know at info at proklear.com

    Thanks,
    Satish

    Reply

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