Gtechniq G1 Smart Glass Water Repellent Spray, Rain Repellent Car Windscreen Cleaner Repels Water off Glass up to 20,000 miles, 100ml

This is easy to apply, works similar to rainex, cant review longevity yet however its been on a month+ and its still the same as the day it. Get a very tiny amount of wiper judder in mild rain but its next to nothing, its not enough to bother me thats for sure. *Update* the product lasts about 9 months, i applied in August 2024 and come Apr/May it was starting to fade, the vehicle does about 5k a year so not high mileage. It was applied after using cerium oxide to polish the glass, clay bar then Iso alc to clean any residue so i dont believe any other type of application procedure would increase longevity.

Gtechniq G1 is hands-down the best product I've ever used on my car windows. It repels any water effortlessly of the windows and windscreen, especially whilst driving. I've used many different products over the years and Gtechniq G1 has been by far the best. The application of G1 is certainly the easiest I've known and the durability of the product since the application has been superb! Top product from a top company

i use this on all our families cars. A 15ml bottle goes a long way. it does recommend to do the windshield thrice but i do 2 coatings on the windshield and 1 coat on all other windows. It lasts up to a year but provides great waterproofing for about 9-10 months before it dwindles down. It makes driving on rainy days that much safer. When applying i use autoglym glass polish to clean the glass first and then apply. The residue is a little tricky to remove and 15ml of the residue remover is not enough. you will have to buff with quite a lot of strength to remove but the results are well worth it. I recommend it to everyone.

Quite hard to apply and takes a while, especially to remove the residue. However, worth it when it’s finally done. Will see how long it lasts now as it’s only been a week so far.

It lasted about 3 months, just under 5,000 miles and 3 car washes (hand wash but with jet sprayer and foam). When it was first applied, it was quite good, to see a real benefit the car has to be doing at least 50mph. The application is really awkward and is done in 3 steps, and you have wait after each one. I didn't mind it as the product was advertised as something that would last a year but 3 months is too short for me. I have cleaned and polished the glass with recommended products, I gave it time to set and followed all instructions, still the outcome was only 3 months. The bottle is really stingy, 15ml is barely enough to cover front and back. Personally, I will try a product which has easier application in the future.

Easy to apply to the windscreen, so far it has survived 2 weeks and 2 pressure washer cleans for its price its 100% worth it. It is extremely effective at preventing water and dust from sticking to the windscreen

I love Gtechniq but this really hasn’t lived up to the marketing. I prepped the screen exactly as per the instructions. Making sure nothing with left on. Application was easy enough, going vertically across the screen then horizontally, again applying by the book. First problem I encountered was the wiper blades juddering. I cleaned the blades, and applied some of the left over solution onto them, but it didn’t help. Over time the juddering did stop. Longevity - well I do about 4000 miles a year and it was applied about a year back and it’s non existent. No waterproofing at all. Even after 2-3 months dirt, bird droppings etc would weld its self to the screen. Other products, would easily expel dirt after a quick blast with the screen wash, but not this. I really wouldn’t bother applying again, il just go back to using rain x or another product when I next give the car its annual deep clean and protection. A shame as Gtechniq make some real quality products.

I’ve used this product on various cars over the years and has always done a good job. The longevity of the products is down to how clean your windscreen is and the temperature when applied. Generally lasts about 2 - 2.5 years before you need to reapply. A spring morning seems to be the best time to apply if you’re not lucky enough to own a garage. The box was smashed to pieces but as that is not a reflection on the product it still gets 5 stars. Amazon shame on you for poor packing.

Très bien

Beads water on windows and lasts quite a long time. Way better than rain x

Not nearly enough for the entire car

Great product good price easy to apply works great

Spent a lot of time as per instructions, and after all the prep, no better results than direct Rain Ex application, without all the work, waste of money.