3M Professional Grade Rubberized Undercoating (16 oz, Pack of 12)
Priced as of May 16, 2026
4.6(119 ratings)Buy on AmazonSaved to your guest loadout. Sign up to also save to your Cabinet (consumables) or Kit (tools you own).
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Prices may varyFrom the Safety Data Sheet
Full SDS ↗ (rev. 2023-08-13)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.
EyesRequiredMfr. SDS §8 · 29 CFR 1910.133(a)(1) · GHS H319SkinRequiredMfr. SDS §8 · 29 CFR 1910.138(a) · GHS H315LungsRequiredMfr. SDS §8 · 29 CFR 1910.134 · GHS H370Ventilation—No PPE in published sourcesShow details for all categories ▾Hide details ▴
From the manufacturer’s Safety Data Sheet, Section 8
“SDS §8 specifies full face shield and indirect vented goggles. H319 (eye irritation Cat 2) at SDS §2 combined with overhead aerosol application confirms required tier.”
— 3M
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 polymer laminate gloves (nitrile for incidental contact). H315 (skin irritation Cat 2) at SDS §2 and direct overhead spray exposure warrant gloves for the full application duration.”
— 3M
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
“SDS §8 specifies a half facepiece or full facepiece supplied-air respirator. The DANGER signal word is driven by H370 (STOT-SE Cat 1, cardiovascular) and H372 (STOT-RE Cat 1, nervous/respiratory systems) at mixture level per SDS §2; overhead aerosol application in a semi-enclosed garage is the primary exposure scenario.”
— 3M
U.S. regulatory standard
29 CFR 1910.134; 1910.138; 1910.1000
“the primary objective shall be to prevent atmospheric contamination… When effective engineering controls are not feasible… appropriate respirators shall be used.”
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.
CarCareTruth's Analysis
Last reviewed May 16, 2026
TL;DR Premium rubberized asphalt undercoating with manufacturer-documented 500-hour salt spray and water immersion resistance — the aerosol wand handles overhead frame-rail application for a standard DIY setup, though the community review base is thin at 119 ratings. The SDS carries a DANGER signal word; required-tier respiratory protection is needed for overhead aerosol use.
What it is and how it performs
A petroleum-based rubberized asphalt aerosol that leaves a corrosion barrier, dampens road noise, and seals moisture from frame rails, seams, and wheel wells. The 3M TDS documents excellent adhesion to bare metal after two days, excellent abrasion resistance at 90 PSI gravel impact, and no corrosion after 500 hours of 5% salt spray and 500 hours of water immersion — the strongest documented performance data in the undercoating category. Tack-free in 15 minutes. Coverage is approximately 16 sq ft per can; the 12-pack provides enough volume to treat a full undercarriage with overlapping passes without running short mid-job. Apply in multiple overlapping passes with the can at the recommended distance to ensure seams and hard-to-reach areas get full coverage.
Who should buy this — and who should skip it
The right buyer is a salt-belt or coastal daily-driver owner who wants the strongest documented performance data in the category and can work a creeper with proper PPE. Skip it if the vehicle has active rust perforation — undercoating over corroding metal traps moisture and can accelerate the problem; a rust converter or encapsulator comes first. Also skip aerosol formats if the application space is a closed garage with no cross-ventilation.
Safety and environmental impact
The SDS (Version 4.00, 2023) carries a DANGER signal word from reproductive toxicity, single-exposure organ toxicity, and repeated-exposure organ toxicity classifications at the mixture level. SDS §8 specifies a half facepiece or full facepiece supplied-air respirator, polymer laminate gloves, and a full face shield; exhaust ventilation to prevent vapor build-up is specified as the engineering control. Prop 65 warning applies based on multiple listed ingredients in the US MSDS §15. VOC is 426 g/L. The cured film stays on the undercarriage; the mixture carries chronic aquatic toxicity classification at the H412 level.
Frequently asked questions
Why does this product have a DANGER signal word?▾
SDS §2 (NZ GHS, Version 4.00, 2023) confirms the mixture-level classification includes H360 (Reproductive Toxicity Cat 1), H370 (STOT-SE Cat 1 — causes damage to the cardiovascular system from single exposure), and H372 (STOT-RE Cat 1 — causes damage to the nervous system and respiratory system through repeated exposure). These are the most severe GHS tiers and are the basis for the DANGER signal word on this product.
What respiratory protection does the SDS specify for aerosol application?▾
SDS §8 specifies a half facepiece or full facepiece supplied-air respirator. Overhead application beneath a vehicle in a semi-enclosed garage is a high-exposure scenario; SDS §8 engineering controls specify exhaust ventilation to prevent vapor build-up — at minimum, open doors and achieve cross-ventilation before spraying.
How does the 3M product compare to Rust-Oleum undercoating for corrosion protection?▾
The 3M TDS documents 500-hour 5% salt spray resistance with no corrosion and excellent adhesion and abrasion ratings — comparable to top-tier category performance data. The review base is smaller (119 Amazon ratings vs. 7,000+ for Rust-Oleum), so long-term multi-season community confirmation is thinner, though 3M holds the #1 bestseller rank in Automotive Undercoat Paint.
Does it work upside down for undercarriage spraying?▾
The 16 oz aerosol cans are designed for overhead undercarriage application; standard any-angle aerosol use applies. The TDS recommends applying in multiple overlapping passes at the correct distance for full coverage of seams and frame rails.
Should I apply this over rust?▾
This product is designed for bare or primed metal. Applying over active rust perforation or loose scale traps moisture beneath the film. Wire-brush or sand loose material first; if the surface has significant rust penetration, a rust converter or encapsulator is the correct first step before undercoating.
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Manufacturer specifications
- Product Dimensions
- 24 x 15 x 9.5 inches; 12 Pounds
- Item model number
- 8542050413
- Date First Available
- July 20, 2015
- ASIN
- B00QU5C700
- Best Sellers Rank
- See Top 100 in Automotive
- Brand Name
- 3M
- Paint Type
- Specialty
- Specific Uses For Product
- car
- Surface Recommendation
- Floor
- Item Form
- Aerosol
- Included Components
- painting
- Container Type
- Can
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