CarCareTruth Score
Decent.
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The 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 aspiration toxicity — thin, oily liquids can slip into the lungs if swallowed, causing chemical pneumonia.
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
“No eye irritation or serious eye damage classification in SDS §2. Aerosol mist near the face during spray application is the specific exposure trigger · eye protection applies in that scenario.”
— WD-40
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 skin. Absence does not imply “not needed” — consult the full Safety Data Sheet.
From the manufacturer’s Safety Data Sheet, Section 8
“No respiratory irritation classification (H335) in SDS §2. The aerosol form factor creates fine mist during application · aerosol mist in enclosed spaces is the primary inhalation risk. H336 (narcotic effects from STOT SE 3) is a CNS hazard, not a respiratory irritant, and does not escalate the lungs tier above situational.”
— WD-40
U.S. regulatory standard
29 CFR 1910.1200(f); 1910.132(d)
“The employer shall assess the workplace to determine if hazards are present, or are likely to be present, which necessitate the use of personal protective equipment.”
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.
The published Safety Data Sheet for this product does not specify ventilation protection for consumer use.
Workplace context
29 CFR 1910.134(a); 1910.1000
“the primary objective shall be to prevent atmospheric contamination [via] accepted engineering control measures (for example, enclosure or confinement of the operation, general and local ventilation…).”
Triggered by GHS H336 on the SDS.
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
PPE tiers translate the manufacturer’s SDS and U.S. regulatory standards. Not professional safety advice. How we report safety.
Last reviewed June 12, 2026
Performance claims are manufacturer-only, and the community track record is still thin, so treat the verdict as provisional. The DANGER signal word comes from an aspiration hazard if swallowed, not inhalation chemistry. Aerosol mist in enclosed spaces is the primary inhalation risk.
An aerosol penetrating oil for freeing rusted nuts, bolts, threads, locks, and chains. The Smart Straw flips between a precision stream and a fan spray for tight clearances. The Blu Torch Technology additive package claims protective residue that resists re-seizure · unconfirmed by independent reviews. Buyers actively shopping the category should compare against products with documented community records.
DANGER signal word from H304 aspiration toxicity · swallowing risk, not inhalation in normal use. Do not induce vomiting if ingested; seek medical attention. Aerosol mist in enclosed spaces is the primary inhalation risk. No respiratory irritation code at the mixture level. Prop 65 not required per the 2024 SDS; CARB compliant. Petroleum-distillate carrier is expected to harm aquatic life per SDS §12.
Is this safe on rubber and plastic? The product listing states compatibility with metal, plastic, and rubber; SDS has no incompatibility warnings. Test on a small area first for delicate trim. Why DANGER if there's no respiratory irritation code? H304 drives DANGER · aspiration toxicity if swallowed, not an inhalation risk during normal spray use.
The Safety Data Sheet for WD-40 Specialist Rust Release Penetrant Spray carries a DANGER signal word, with classified hazards including H222 (extremely flammable aerosol); H304 (may be fatal if swallowed and enters airways); H336 (may cause drowsiness or dizziness). See the PPE breakdown above for use-case-specific guidance translated from the SDS hazard codes.
CarCareTruth scores WD-40 Specialist Rust Release Penetrant Spray at 5.9 out of 10 on the composite CCT score, with a health sub-score of 5.0/10. 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 (rev. 2024-12-18): LVP Petroleum Solvent (CAS 64742-47-8) 50·70%; Petroleum Solvent (CAS 64742-47-8) 20·40%; Petroleum Base Oil (mixture) <10%; Carbon Dioxide (CAS 124-38-9) 2·3%.
Marketing copy from WD-40, via Amazon. Not editorial.
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