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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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From the manufacturer’s Safety Data Sheet, Section 8
“SDS §8.3 explicitly states 'Use splash goggles when eye contact due to splashing is possible.' No H319 or H318 in §2 mixture classification. Splash at the valve stem during aerosol discharge is the specific cited trigger.”
— Fix-A-Flat
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
“H317 (skin sensitizer) in §2 mixture classification, driven by MIT preservative at 0.0015·0.01%. MIT is a confirmed contact sensitizer. The risk is sensitization in susceptible individuals, not irritation in the general population. Standard roadside use involves minimal skin contact.”
— Fix-A-Flat
U.S. regulatory standard
29 CFR 1910.138(a); 1910.132(d)
“appropriate hand protection when employees' hands are exposed to hazards such as those from skin absorption of harmful substances.”
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 lungs. Absence does not imply “not needed” — consult the full Safety Data Sheet.
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 #5 of 12 in Tire Repair Kit.Three above it ↓
Last reviewed June 28, 2026
TL;DR Community reviews confirm this aerosol seals most tread-area punctures and re-inflates the tire to driveable pressure · and Fix-A-Flat explicitly claims the formula is TPMS-safe, a critical differentiator for any modern vehicle. It's a temporary fix: get to a tire shop within 100 miles or 3 days.
Fix-A-Flat S60420 is a single-step aerosol emergency tire repair for standard passenger-car tires: attach to the valve stem, press, and the can simultaneously seals the puncture and re-inflates. It's well-reviewed by a large owner base, where the dominant theme is "worked when I needed it" on tread punctures up to 1/4 inch. Fix-A-Flat claims TPMS-safe formula; no widespread sensor damage appears in the current eco-formula review pool. Drive no more than 100 miles or 3 days, then visit a tire shop.
A sensible trunk backup for any driver who wants a no-tools, no-jack roadside option. TPMS-safe claim covers modern vehicles; the SKU lineup (12·24 oz) ranges from compact to SUV. Skip it for sidewall tears, run-flat tires, or if the nearest shop is beyond 100 miles.
The SDS lists signal word WARNING. H317 (skin sensitizer) comes from the MIT preservative · not from natural rubber latex. SDS §8.3 specifies splash goggles when splashing is possible; those with known MIT sensitization should handle with gloves. No inhalation H-codes in the §2 mixture classification; outdoor use poses no meaningful inhalation risk. SDS §15 explicitly negates Prop 65 concern · the product listing's flag is a false positive. Non-flammable propellant (DOT Class 2.2). Depressurize fully before disposal; SDS §13 directs to a hazardous waste collection point.
The Safety Data Sheet for Fix-A-Flat S60420 Aerosol Emergency Tire Sealant carries a WARNING signal word, with classified hazards including H229 (pressurized container: may burst if heated); H317 (may cause an allergic skin reaction). See the PPE breakdown above for use-case-specific guidance translated from the SDS hazard codes.
CarCareTruth scores Fix-A-Flat S60420 Aerosol Emergency Tire Sealant at 7.1 out of 10 on the composite CCT score, with a health sub-score of 9.0/10. 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: SDS §3 (Version 3.0, revision 3/10/2025): Glycerol (CAS 56-81-5) 1·5%; Quartz, SiO2 (CAS 14808-60-7) 0.1·1%; Magnesium oxide (CAS 1309-48-4) 0.1·1%; Cellulose (CAS 9004-34-6) 0.1·1%; Propan-2-ol / IPA (CAS 67-63-0) 0.01·0.1%; 2-methylisothiazol-3(2H)-one / MIT (CAS 2682-20-4) 0.0015·0.01%. Primary sealant polymer not named in §3 (trade secret). No natural rubber/latex listed.
Marketing copy from Fix-A-Flat, via Amazon. Not editorial.
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