CarCareTruth Score
Decent, but wear gloves and ventilate.
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Prices may varyThe manufacturer's Safety Data Sheet classifies this product with one or more GHS Category 1 health hazards — the most severe tier. The hazard statements in quotes below are the verbatim GHS language from the SDS, as required by OSHA's Hazard Communication Standard. The line under each statement translates the GHS classification into plain language.
GHS Category 1 eye damage — classified as causing irreversible eye damage on contact.
GHS Category 1 carcinogenicity — classified as suspected of causing cancer with repeated or prolonged exposure.
If swallowed, inhaled, or splashed in eyes:
Call Poison Control immediately at 1-800-222-1222 (US, 24/7, free) and have the product container with you. Poison Control's standing guidance is to not induce vomiting after chemical exposure; they will direct first-aid steps based on the specific product.
About this product's hazards. This product's Safety Data Sheet uses signal word danger. Read the manufacturer's SDS and follow all safety instructions before use. CarCareTruth ratings translate the manufacturer's safety sheet. They do not replace the SDS or substitute for a hazard assessment specific to your task.
Health score is for adult use as intended, per the manufacturer's SDS. It does not model child ingestion, accidental spill cleanup, or off-label use. See the safety panel below for full hazard classification, and /disclaimer for the full editorial scope.
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.
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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.
This product ranks #10 of 12 in Rain Repellent & Water Beading.Three above it ↓
Last reviewed June 14, 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.
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: owners report 15+ minutes of hard work, and some consider 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.
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.
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.
The Safety Data Sheet for Gtechniq G5 Water Repellent Coating carries a DANGER signal word, with classified hazards including H226 (flammable liquid and vapour); H315 (causes skin irritation); H318 (causes serious eye damage). See the PPE breakdown above for use-case-specific guidance translated from the SDS hazard codes.
CarCareTruth scores Gtechniq G5 Water Repellent Coating at 5.8 out of 10 on the composite CCT score, with a health sub-score of 3.8/10. The CCT score blends real-world effectiveness, ingredient health impact pulled from the manufacturer's safety sheet, and environmental footprint against a published category rubric. See the methodology link on this page for the full scoring breakdown.
Per the Safety Data Sheet ingredient disclosure: Hydrocarbons C4 triisobutylene fraction hydrogenated (CAS 93685-81-5, 12.5·20%), Hydrocarbons C10-C12 isoalkanes <2% aromatics (5·10%), Sulphuric acid (CAS 7664-93-9, 5·10%)
Marketing copy from Gtechniq, via Amazon. Not editorial.
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