3M
3M 8367 Black 1‑Component Seam Sealer 310 mL Dual Cartridge – 10 min Work, 24 hr Cure
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Hazardous material · Paste
This hazardous material ships ground-only. A handling surcharge may be added at checkout.
Shipping restrictions apply
Ground freight only (UPS/FedEx). Cannot ship via Air, USPS, or to PO boxes. APO/FPO addresses excluded.
WARNING: Cancer & Reproductive Harm
California Pro65 Warning: Cancer and Reproductive Harm
Tap for details → P65Warnings.ca.gov
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Overview
Built for the job.
Our 3M™ urethane seam sealer is a high solids seam sealer ideal for sealing automotive and RV seams and joints. It adheres well to bare metal, primed metal and painted surfaces and if desired can be smoothed to a featheredge and/or brushed. Tack-free and paintable after 30 to 45 min, this urethane formula is…
Why Pros Choose 3M 1-Component
- High quality, single-component formula adheres well to bare metal, primed metal and painted surfaces
- Moisture curing property provides excellent performance in high heat and humidity environments
- Non-shrinking, non-cracking, low/no odor formula remains flexible and offers superior results to solvent-based sealers
- Paintable after 30 to 45 min
- Thick consistency is able to fill large voids
- Can be smoothed to a featheredge or brushed
- Recommended for use with 3M™ single-component cartridge applicator gun PN08990 or 3M™ professional caulking gun PN08993
How to Use
For adhering floor coverings, bare metal, door hem flanges, door jambs, door skins, exterior seams and joints, fastening headliner and ceiling systems, floor pans, galvanized, general-purpose, interior seams and joints
Compatibility
Compatible substrates: Bare Metal.
Compatible paint systems: Urethane, Epoxy, Solvent.
Specifications
| Part No. | 8367 |
|---|---|
| Product Line | MMM |
| MFR Model | 08367 |
| Standard/Approvals | California Pro65 Warning: Cancer and Reproductive Harm |
| Application | For adhering floor coverings, bare metal, door hem flanges, door jambs, door skins, exterior seams and joints, fastening headliner and ceiling systems, floor pans, galvanized, general-purpose, interior seams and joints |
| Manufacturer | 3M Products |
| Alternate Part Number-1 | 60455054621 |
| UPC | 051135083673 |
| Brand | 3M™ |
| Maximum Sale Quantity | 12 |
| Maximum Sale Day | 7 |
| Applicable Materials | Bare Metal, Primed Metal, Painted Surfaces |
| Composition | 15 to 40% Urethane Polymer, 10 to 30% PVC, 10 to 30% Sulfonic Acids, C10-18-Alkane, Ph Esters, 5 to 10% Xylene, 1 to 5% Calcium Oxide, 1 to 5% Ethylbenzene, 0.5 to 1.5% Hydrotreated Light Petroleum Distillates, 0.1 to 1% Carbon Black, 0.1 to 1% P,P'-Methylenebis(Phenyl Isocyanate) |
| Application Time | 10 min |
| Paintable (Y/N) | Yes |
| Specific Gravity | 1.17 |
| Base Type | Urethane |
| Component | 1K |
| Odor/Scent | Solvent |
| Color | Black |
| Container Size (mL) | 310 |
| Flash Point | 92 deg F |
| Container Type | Dual Cartridge |
| Form | Paste |
| Temperature Rating (deg F) | >200 deg C Autoignition, -25 to 180 |
| Type | 1-Component |
| Curing Time | 24 hr |
About 3M
3M is a global leader in abrasives, masking, and body repair products. Trusted by OEM collision centers for high-performance prep and finishing solutions.
Frequently Asked Questions
What surfaces can 3M MMM be used on?
3M MMM is compatible with Bare Metal. Always ensure the surface is properly cleaned, degreased, and sanded before application to achieve the strongest adhesion and a professional finish.
What is the cure or dry time for 3M MMM?
The curing time for 3M MMM is 24 hr. Drying and curing times may vary with temperature, humidity, and film thickness — always consult the Technical Data Sheet (TDS) for exact cycle conditions.
What size does 3M MMM come in?
This listing ships 3M MMM in a 310 container. Check the autofxmart catalog for other sizes and bulk pricing.
How fast does autofxmart ship 3M MMM?
Most in-stock orders for 3M MMM ship the same or next business day from our US warehouse. Expedited options are available at checkout. Freight-class items may require an additional 1–2 days for carrier pickup.
Is this 3M product genuine?
Yes. autofxmart is an authorized distributor of 3M products. Every unit is factory-fresh, sealed, and backed by the manufacturer's standard warranty. If you have a concern, contact support@autofxmart.com and we will make it right.
What is the manufacturer part number (MPN) for 3M MMM?
The MPN for 3M MMM is 8367. Use this number when cross-referencing against TDS, SDS, or legacy supplier catalogs.
Documents & Safety
DANGER: This seam sealer contains hazardous chemicals that can cause serious health effects including cancer, reproductive harm, eye damage, skin corrosion, and respiratory issues. Required PPE: safety glasses or goggles, chemical-resistant gloves, protective clothing, and respirator. Avoid skin and eye contact, inhalation of vapors, and ingestion. Use only in well-ventilated areas. Can cause aspiration hazard if swallowed. Always refer to the full SDS before use.
Why Buy from autofxmart
- Authorized distributor — authentic, factory-fresh stock.
- Fast US shipping — most orders ship within 1 business day.
- 30-day returns — buy with confidence.
- Pro-shop pricing — bulk discounts available on request.
- Expert support — questions? Email us at support@autofxmart.com.
How to apply
Steps
1Clean both surfaces to bare, dry substrate.
2Load the cartridge and fit the mixing nozzle.
3Apply an even bead (or clamp) where needed.
4Tool or smooth the joint before it skins over.
5Allow to cure fully before stressing or painting.
Specifications
Full data
Frequently asked
Good to know
3M Products MMM is compatible with Bare Metal. Always ensure the surface is properly cleaned, degreased, and sanded before application to achieve the strongest adhesion and a professional finish.
The curing time for 3M Products MMM is 24 hr. Drying and curing times may vary with temperature, humidity, and film thickness — always consult the Technical Data Sheet (TDS) for exact cycle conditions.
This listing ships 3M Products MMM in a 310 container. Check the autofxmart catalog for other sizes and bulk pricing.
Most in-stock orders for 3M Products MMM ship the same or next business day from our US warehouse. Expedited options are available at checkout. Freight-class items may require an additional 1–2 days for carrier pickup.
Yes. autofxmart is an authorized distributor of 3M Products. Every unit is factory-fresh, sealed, and backed by the manufacturer's standard warranty. If you have a concern, contact support@autofxmart.com and we will make it right.
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