Gtechniq G5 Water Repellent Coating
Priced as of May 17, 2026
4.2(196 ratings)Subscribe & Save: $18.85 (5% off)Buy on AmazonSaved to your guest loadout. Sign up to also save to your Cabinet (consumables) or Kit (tools you own).
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Prices may varyFrom the Safety Data Sheet
Full SDS ↗ (rev. 2020-07-01)GHS hazard codes are quoted from the manufacturer’s Safety Data Sheet. PPE tiers below translate those codes and the listed ingredient chemistry; they are not CarCareTruth recommendations.
EyesRequiredMfr. SDS §8 · 29 CFR 1910.133(a)(1) · GHS H318SkinRecommendedMfr. SDS §8 · 29 CFR 1910.138(a) · GHS H315LungsSituationalMfr. SDS §8 · 29 CFR 1910.1003 · GHS H350Ventilation—No PPE in published sourcesShow details for all categories ▾Hide details ▴
From the manufacturer’s Safety Data Sheet, Section 8
“H318 (serious eye damage Cat 1) in SDS §2 — the most severe eye hazard classification. Permanent damage is possible from direct contact with the formula.”
— Gtechniq
U.S. regulatory standard
29 CFR 1910.133(a)(1); 1910.151(c)
“The employer shall ensure that each affected employee uses appropriate eye or face protection when exposed to eye or face hazards from… liquid chemicals, acids or caustic liquids…”
ANSI Z87.1 (chemical splash protection — incorporated via §1910.6)
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
From the manufacturer’s Safety Data Sheet, Section 8
“H315 (skin irritation Cat 2) in SDS §2. Sulphuric acid at 5–10% warrants nitrile gloves for any handling.”
— Gtechniq
U.S. regulatory standard
29 CFR 1910.138(a)
“appropriate hand protection when employees' hands are exposed to hazards such as those from… chemicals which produce an adverse effect on the skin or eyes…”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
From the manufacturer’s Safety Data Sheet, Section 8
“No H335 in SDS §2. Petroleum hydrocarbon carrier with ≤5% VOC presents minimal inhalation concern outdoors. In a closed garage, flash point 31°C (H226) and the low-vapor carrier warrant ventilation.”
— Gtechniq
U.S. regulatory standard
29 CFR 1910.1003; substance-specific 1910.1001–1910.1052
“Each employer shall ensure that no employee is exposed [in excess of the substance-specific PEL]…”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
No PPE specified in published sources for ventilation. Absence does not imply “not needed” — consult the full Safety Data Sheet.
PPE tiers translate the manufacturer’s SDS and U.S. regulatory standards. Not professional safety advice. How we report safety.
CarCareTruth's Analysis
Last reviewed May 17, 2026
TL;DR Community confirms 3–4 months of glass protection on a daily driver with wiper shutoff above 35–40 mph — the trade-off is a demanding 15+ minute buffing step. The SDS carries H350 (carcinogen) and H318 (serious eye damage); safety goggles are required.
What it is and how it performs
G5 creates a hydrophobic surface that beads water tightly and sheets rain off at speed. Apply a small amount to clean, dry glass in sections, wait 10–15 minutes for haze, then buff out by hand or with a polishing attachment. The buffing step is the main weakness: multiple buyers report 15+ minutes of hard work, with a professional detailer calling the effort-to-benefit ratio unwarranted versus weekly Rain-X. Thin application in small sections produces the best results. Community confirms 3–4 months on a normally-washed daily driver, consistent with the label.
Who should buy this — and who should skip it
Best for city or suburban drivers who want to cut wiper use — the 30 mph wiper-off threshold matters where highway speeds aren't always reached. Skip it if the buffing step is a dealbreaker, or if you work in a small unventilated garage. For longer durability without the effort, a bonded glass coating (Gtechniq G1) lasts 6–18 months.
Safety and environmental impact
H350 (carcinogen, sulphuric acid mist — IARC Group 1 occupational classification) and H318 (serious eye damage Cat 1) drive the DANGER signal word; safety goggles are required. H315 and H226 (flash point 31°C) warrant nitrile gloves and outdoor application. Low VOC (≤5%); H412 notes aquatic persistence — keep away from drains.
From the manufacturer
Marketing copy from Gtechniq, via Amazon. Not editorial.
- •WATERS BEADS OFF EVEN AT LOW SPEEDS - this windshield rain repellent helps rain simply roll off, even at speeds as low as 30mph, and keeps your windscreen cleaner, giving you clear vision for improved safety on the road
- •EASIER TO REMOVE CONTAMINANTS - glass treated with G5 windshield water repellent stays cleaner for longer making bugs, bird droppings and even ice quicker and effortless to remove with windshield cleaner
- •EASY TO APPLY - simply apply the windshield coating to glass for excellent results that you'll notice as soon as it rains or when you need to clean your windows with car window cleaner - a must-have for your car cleaning kit
- •MADE BY THE WORLD LEADER IN MOLECULAR NANOTECHNOLOGY – founded in 2001 by a quantum physicist, Gtechniq's car cleaning products use innovative, advanced technology to achieve a level of performance that outclasses any others on the market
- •100% CUSTOMER SATISFACTION FROM UK BASED GLOBAL COMPANY – sold in 50 countries worldwide, Gtechniq's been the no 1 choice of high-end vehicles for over 20 years, and is passionate about the quality of its products and the stellar service it provides
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Manufacturer videos
Manufacturer specifications
- Manufacturer
- Gtechniq
- Brand
- Gtechniq
- Model
- G5 0.1
- Item Weight
- 4.2 ounces
- Product Dimensions
- 1.57 x 1.57 x 5.71 inches
- Item model number
- G5 0.1
- Is Discontinued By Manufacturer
- No
- Exterior
- Water Repellent Coating
- Manufacturer Part Number
- G5 0.1
- Special Features
- G5 Water Repellent Coating
- ASIN
- B004JNRROQ
- Customer Reviews
- 4.2 4.2 out of 5 stars (196) 4.2 out of 5 stars
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Top Amazon review
↗External — Amazon's most-helpful review for context.
Easy to use and lasts.
Easy to apply, works as well as Rain X however lasts a lot longer. Saw a review and decided to try it. For the price it's a no brainer. I saw comments that it was difficult to remove however I did mine on a cloudy day with temps in the low 60s. I used a new microfiber cloth from Costco to remove and had no issues. Follow the instructions to shake well and use a small amount and wait the 15 minutes before buffing.