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 germ-cell mutagenicity — classified as suspected of causing heritable genetic damage.
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
“SDS §8 specifies safety eyewear designed to protect against splash of liquids. H319 (serious eye irritation) at SDS §2 and overhead aerosol application confirm required tier.”
— Rust-Oleum
U.S. regulatory standard
29 CFR 1910.133(a)(1)
“The employer shall ensure that each affected employee uses appropriate eye or face protection when exposed to eye or face hazards from… liquid chemicals…”
ANSI Z87.1 (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
“SDS §8 specifies impervious gloves. Overhead aerosol application with solvent-heavy formula warrants gloves for the duration of application.”
— Rust-Oleum
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
“SDS §8 specifies a NIOSH/MSHA approved air purifying respirator with organic vapor cartridge for conditions where airborne concentrations are expected to exceed exposure limits. Overhead aerosol application in a semi-enclosed garage is a high-exposure scenario; the DANGER-rated flammable aerosol and the H336 (may cause drowsiness or dizziness) inhalation classification at §2 make this an acute-inhalation basis, not boilerplate.”
— Rust-Oleum
U.S. regulatory standard
29 CFR 1910.1000; 1910.1200
“Each employer shall assure that no employee is exposed to an inhalation concentration of any substance shown in Tables Z-1, Z-2, or Z-3 in excess of the limits in the tables.”
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.
This product ranks #5 of 6 in Undercoating.Three above it ↓
Last reviewed July 7, 2026
TL;DR Solid multi-season rubberized undercoating, well-reviewed by a large owner base that confirms corrosion protection through several winters in northern-tier states, though wheel arch edge lifting appears by year three in heavy salt-belt use. The SDS carries a DANGER signal word; required-tier respiratory protection is needed for overhead aerosol use.
A petroleum-based rubberized aerosol that leaves a corrosion barrier, dampens road noise, and seals moisture from frame rails and seams. Any-angle spray handles overhead application; coverage is 10·15 sq ft per can · plan 3·4 cans for a full undercarriage. Dry time is one hour. The film holds through multiple winters on properly prepared bare or primed metal; wheel arch edge lifting by year three is the most common failure under heavy salt exposure.
The right buyer is a daily-driver owner in a salt-belt or coastal state willing to work a creeper with proper PPE. Skip it if the vehicle has active rust perforation · undercoating over corroding metal traps moisture; a rust converter or encapsulator comes first. Skip this aerosol format without adequate ventilation.
The SDS (revised February 2026) carries a DANGER signal word from carcinogen and mutagen classifications at the mixture level from the LPG propellant fraction. SDS §8 specifies an organic vapor cartridge respirator, impervious gloves, and liquid-splash eyewear; cross-ventilation is the minimum engineering control. Prop 65 warning applies. VOC is approximately 416 g/L. The cured film stays on the undercarriage; xylenes carries aquatic toxicity at the ingredient level.
The SDS §2 mixture classification includes H340 (germ cell mutagen, Cat 1B) and H350 (carcinogen, Cat 1A) from the liquefied petroleum gas propellant fraction · these are the most severe classification tiers under GHS. The SDS was revised February 2026 and supersedes the previous 2024 version. Prop 65 warning is present based on these classifications.
SDS §8 specifies a NIOSH/MSHA approved air purifying respirator with organic vapor cartridge or canister for conditions where airborne concentrations may exceed exposure limits. Overhead application under a vehicle in an enclosed garage is a high-exposure scenario; open the garage door and achieve cross-ventilation as a minimum step, per SDS §8 engineering controls guidance.
Well-reviewed by a large owner base, community reviews confirm adequate multi-season protection on properly prepared bare or primed metal. Long-term owners in northern states cite protection through multiple winters when the product is applied correctly, though some edge lifting at wheel arches by year three is noted in northern-tier accounts. Manufacturer coverage is stated as 10·15 sq ft per can; plan 3·4 cans for a full undercarriage.
Yes · the any-angle spray technology on the 248656 allows continuous spray in any orientation including directly overhead, which is the primary application scenario for undercarriage work. The wide comfort spray tip is designed for extended use at uncomfortable angles.
This product is designed for bare or primed metal. Applying it over active rust perforation or loose scale traps moisture and can accelerate the problem underneath. Wire-brush or sandblast loose material first; if the surface has significant rust penetration, a rust converter or encapsulator is the correct first step before undercoating.
Marketing copy from Rust-Oleum, via Amazon. Not editorial.
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