CarCareTruth Score
Mediocre.
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Prices may varyHealth 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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No PPE specified in published sources for eyes. Absence does not imply “not needed” — consult the full Safety Data Sheet.
The published Safety Data Sheet for this product does not specify skin protection for consumer use.
Workplace context
29 CFR 1910.1000; 1910.1200
“Each employer shall assure that no employee is exposed [in excess of the PEL]…”
Triggered by GHS H361f on the SDS.
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
From the manufacturer’s Safety Data Sheet, Section 8
“H335 absent from SDS §2 · no classified respiratory irritation. SDS §8 ventilation language is generic boilerplate. Estimated VOC <50 g/L.”
— Mothers
U.S. regulatory standard
29 CFR 1910.134; 1910.138; 1910.1000
“the primary objective shall be to prevent atmospheric contamination…”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
UN GHS hazard statement
H373“May cause damage to organs through prolonged or repeated exposure”
UN GHS Rev. 9 (2021)
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 #29 of 29 in Ceramic Spray Coating.Three above it ↓
Last reviewed June 29, 2026
TL;DR Forum members on AutoGeek and 1addicts consistently report 4-6 months of effective water-beading on a regularly washed daily driver; the label's "up to 1 year" claim is a best-case that few confirm. Spray-and-wipe application with no suede applicator or flash timing pressure makes this one of the more accessible first ceramic coatings. The SDS carries a Prop 65 warning (titanium dioxide, trace methanol) and classifies the main siloxane active ingredient as a suspected reproductive toxin.
CMX bonds a silica-based protective film to paint using a genuine ceramic chemistry with a silane crosslinker that hydrolyzes on contact with the paint surface. Application is beginner-friendly: spray onto a clean panel, spread with a foam applicator pad (included in some retail packages), and buff off with a microfiber cloth. No timed flash window and no suede applicator required; the spray-and-wipe format eliminates the main failure mode that trips up first-timers on traditional ceramics. An IPA wipe-down before application is recommended by Mothers and the community for best bonding, but it is not included in the kit. Community tracking on AutoGeek puts hydrophobic performance degrading at the 4-6 month mark on regularly washed daily drivers, well below the 1-year label claim. The coating layers and functions as a maintenance topper over an existing protection.
Best for daily-driver owners who want a step up from spray wax without the complexity of a professional-application ceramic, especially first-timers who are not ready for flash-timing pressure. Skip it if you need multi-year durability: the 1-year label claim overstates community-confirmed results by roughly 2x, and for that gap you should be looking at a suede-applicator alkoxysilane or polysilazane kit that actually approaches multi-year performance with proper prep.
The SDS (02-Nov-2018) carries a WARNING signal word with H361f (suspected reproductive toxin, from the D4 cyclic siloxane below 10%) and H373 (may cause organ damage through prolonged or repeated exposure); no H315, H319, H334, or H335 appear in SDS §2. SDS §15 confirms two Prop 65 chemicals: titanium dioxide (cancer listing applies to airborne inhaled particulate only; not the exposure pathway in a liquid spray-on product under normal use) and methyl alcohol (developmental, present at trace SARA 313 threshold levels). The D4 active ingredient is bioaccumulative (log Kow 5.1 per SDS §12), reflected in the Environment score. The SDS is 2018 vintage; D4 regulatory status has continued to evolve in the EU since initial classification as an SVHC; check for an updated SDS from 2027 onward.
Mothers claims up to 1 year of protection. Community testing on AutoGeek consistently shows 4-6 months on a regularly washed daily driver, closer to the 5-month mark in the most thorough independent tests. Prep quality matters significantly: a well-decontaminated paint surface extends results noticeably. Expect to reapply 2-3 times per year on a daily driver.
The product is marketed as SiO2 + TiO2 chemistry, and the SDS confirms ethyl silicate (TEOS), a genuine alkoxysilane that hydrolyzes to form a silica film on the paint surface. It is a true ceramic coating chemistry, not a carnauba or polymer spray wax. The difference from professional ceramic coatings is the application method (spray vs. suede applicator), cure chemistry, and resulting durability (months vs. years).
The SDS §15 discloses two California Proposition 65 chemicals: titanium dioxide (cancer; the Prop 65 listing applies to airborne inhaled particulate form, which is not the exposure pathway in a liquid spray-on product under normal use) and methyl alcohol (developmental toxin, present at trace levels). The primary active ingredient, octamethylcyclotetrasiloxane (D4), is classified as a suspected reproductive toxin (H361f). The SDS also carries H373 (may cause organ damage through prolonged or repeated exposure), a systemic code from occupational-level exposures.
Mothers markets CMX as both a standalone coating and a maintenance topper. As a topper on an existing coating, it can restore hydrophobicity that has begun to degrade. The formula is layerable; additional coats build additional protection per Mothers' product page. IPA wipe-down prep before application is recommended for best bonding.
CMX is used most often on paint and glass, where owners report good beading on both. The spray-on/wipe-off formula is forgiving enough for glass where professional-grade ceramics require more care, and many owners also run it on wheels and trim. Avoid freshly waxed surfaces, since the wax residue will interfere with silica bonding. A clean, decontaminated surface is required for any durability beyond a few weeks.
Marketing copy from Mothers, via Amazon. Not editorial.
Guide
Ceramic Coating vs Wax vs Sealant: Which Lasts Longest
Carnauba wax lasts 4 to 8 weeks, synthetic sealant 3 to 6 months, DIY ceramic coating 12 to 36 months, professional ceramic 3 to 7 years. The chemistry is the reason. Hybrid ceramic sprays sit with the sealants on durability, not with the ceramics.
Guide
How Long Does Ceramic Coating Actually Last on a Car
A pro-installed coating on a garaged car can hold five to seven years. A DIY 9H kit on an outdoor daily driver lands closer to one to two. Durability is set by prep quality, wash chemistry, parking, and UV dose, not by the warranty number on the box.
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