Gtechniq G1/G2
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Author:  pjgh [ Mon May 03, 2010 9:14 pm ]
Post subject:  Gtechniq G1/G2

First, many thanks indeed to GIZTO29 for sending me a generous amount of product in these small, expensive bottles.

I finally got around to making the application to my new windscreen which is not a a Sunex original, but made in Sweden nevertheless. The one it replaced has been on the car for 21 years, so I think I was due a replacement ... and there's probably no better product out there for medium term protection than Gtechniq.

So ... what are these odd product codes about?

Gtechnic - see: specialise in nano coatings. They make polishes (preceded with the letter P), coatings for paint (letter C), interior coatings (letter I), tyres (T) and glass (G).

From the Gtechniq website:

gtechniq wrote:
What's special about Gtechniq G1 ClearVision Smart Glass?
Unlike regular rain repellent coatings that adhere to the surface of the glass using relatively weak physical bonds, G1 uses a chemical bond which gives G1 unrivalled durability. G1's excellent durability and exceptionally low smear characteristics make it ideal for car windscreens. Please note that with glass coatings there is a trade off between durability and functionality. Whilst G1 is recommended for car windscreens for surfaces such as shower screens or marine glass where maximum repellency is required it is better to use G3 ClearVision Smart Glass (Max Repellency).

G2 is simply a haze remover for G1 ... more on that in a bit.

To business ... and following on from Phil's excellent review: ... hp?t=10231 ... I didn't need the G4 glass polish since I'm dealing with brand new glass. G4 is recommended for old(er) and aged glass. I guess it has some clever nano behaviour which can fill in the inevitable swirling and scratching that happens to glass over time.

Tell you what, let's see what Gtechniq say about it:

gtechniq wrote:
What's special about Gtechniq G4 Glass Nano Polish?
G4 does exactly what it says on the tin. It remove all contaminants from glass or ceramic surfaces which are not removed during normal cleaning process without any damage to the substrate. G4 is easy to use and is exceptionally fast. We recommend using G4 prior to G1 or G3 application on any glass other than on new cars.

That's the prep, then ... in my case I simply use pure IPA at 99.9% purity.

Image ... CF3788.jpg

The darkness on the pad is from wiping the windscreen wipers prior to re-settling them onto the glass. There is some potential for juddering upon first use of the wipers and the recommendation is to wipe the wiper blades with IPA or replace them. I simply dabbed the pad over the mouth of the IPA bottle, inverted a couple of times and wiped over the glass to be sealed.

Application of G1 is easy enough. Use a make-up pad held over the mouth of the bottle and invert two or three times. The bottle is tiny - at just under a tenner for a 15ml bottle you might think they're off their head with prices like that, but this product spreads exceptionally well and even that little 15ml bottle is sufficient for a whole car with ease.

Wiped over clean glass it is easy to see where you've been as the evaporation is quite slow. I chose to go over the glass and then wipe around the edges afterwards. Having about 5-7ml at my disposal, I limited myself to a wndscreen (for two coats) and the rear windscreen ... and the wing mirrors. I found that just about ample and gave the front windscreen one coat, then the rear, then a second one on the front after about 10 minutes and finally the wing mirrors.

Front windscreen:

Image ... CF3786.jpg

... where you can just see an upright shadowing on the left hand side.

Rear windscreen:

Image ... CF3787.jpg

... where you can see a build-up of product at the end of each stroke.

Image ... CF3790.jpg

... again the blackness is from the rubber surround from wiping around the edge at the end.

After 15 minutes of curing time, the product comes up to a light haze. I guess if you use more product then the haze is stronger and this is something I saw on the front windscreen where I was able to see the pattern of the first application, but the overall strength of haze is nothing like opaque.

One of my concerns was how well the product would spread and how easily that haze would remove. Spreading is straightforward and you get a good playtime with the product and ample time to make an even a neat application.

That's one of my concerns out of the way.

For removal, given the potentially small amount of product that might have adhered correctly I chose good old-fashioned elbow grease and was very happy for a little help from G2 around the very edges and stubborn marks. I wrapped a microfibre cloth in a lint-free cotton cloth designed for glass polish removal and this worked well. Gtechniq do say to use cotton, rather than microfibre.

Image ... CF3789.jpg

... the blackness on the cloth is from both the glass and from catching the rubber edges of the screen.

Removal was tough, but concerted effort and 2-3 strokes over a particular area was sufficient to leave gleaming clean glass. G2 can be used to assist removal and where I did use that product around the edges of the screens, it made removal effortless. The product is wiped over the haze and followed on with a cotton cloth - simple, easy and perfect glass left afterwards. G2 reminded me of nail varnish remover, both in scent and colour ... and I wondered if it was little more than a high alcohol wipe with some clever nano behaviour that helped guard against wiping off the now bonded sealant.

Image ... CF3791.jpg

... again the blackness is from the rubber surround from wiping around the edge at the end.

So, removal is again straightforward and uncomplicated. Using good old-fashioned hard work, it is possible to remove the haze if that's the way you want to do it, but using G2 is the easy way.

That's both of my concerns out of the way.

Here's the finished glass:

Image Image ... CF3793.jpg ... CF3794.jpg

In summary, I would happily recommend this kit for its ease of use - that's application and removal. The 15ml bottles give sufficient for a car, or even two if you're careful and given the chemical make-up of the product, it's probably best that you don't keep the leftovers for too long making the amount you get just perfect. I just need some rain to show me how good this product is against other glass sealants I've used and the next 30,000 miles to prove their claims of longevity.

Author:  Mark M [ Mon May 03, 2010 9:21 pm ]
Post subject: 

Fantastic review as usual Paul very detailed and informative !

Author:  Ash [ Mon May 03, 2010 9:24 pm ]
Post subject: 

Good review Paul.

It's just one more on my "list" :wink:

I'm happy with the Carlack glass sealant until it runs out. But this does look better from the video's I've seen.

Author:  pjgh [ Mon May 03, 2010 9:26 pm ]
Post subject: 

Thanks guys - the "devil is in the detail" with this one. The pictures don't show a step by step, but I hope the text allays any fears and goes some way to describe how to easily use this product, trust in what is happening and let it do its job.

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