3M
3M 8374 Gray Sprayable Seam Sealer 10.5 oz Cartridge – 5‑10 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 PROP65 WARNING: This product contains the following chemical(s) known to the State of California to cause birth defects or other reproductive harm. This product contains the following chemical(s) known to the State of California to cause
Tap for details → P65Warnings.ca.gov
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Overview
Built for the job.
3M™ MSP sprayable seam sealer is a gray high-performance, general-purpose seam sealer that can be caulked or sprayed. Our convenient, easy-to-apply sealer adheres well to all primed surfaces, except acrylic lacquer. It offers the convenience of allowing for painting almost immediately after being applied.
Why Pros Choose 3M MMM
- Single component moisture-curing MSP seam sealer offers convenience and quality
- Sealer is formulated for automotive body joints
- Versatile application methods allow caulking or spraying
- Excellent adhesion works well with primed surfaces
- Fast curing allows for immediate painting
- A single component moisture-curing MSP seam sealer
- Designed for interior and exterior body joints
- Can be caulked or sprayed
- Adheres well to primed surfaces except acrylic lacquer
- Paintable immediately
How to Use
For bare metal, door hem flanges, door jambs, door skins, exterior seams and joints, floor pans, galvanized, general purpose, interior seams and joints, joint filling, rear body panels and rocker panels
Compatibility
Compatible substrates: Primed Surface.
Compatible paint systems: Lacquer, Acrylic.
Specifications
| Part No. | 8374 |
|---|---|
| Product Line | MMM |
| MFR Model | 08374 |
| Standard/Approvals | California PROP65 WARNING: This product contains the following chemical(s) known to the State of California to cause birth defects or other reproductive harm. This product contains the following chemical(s) known to the State of California to cause |
| Application | For bare metal, door hem flanges, door jambs, door skins, exterior seams and joints, floor pans, galvanized, general purpose, interior seams and joints, joint filling, rear body panels and rocker panels |
| Manufacturer | 3M Products |
| Alternate Part Number-1 | 60980031284 |
| UPC | 051135083741 |
| Brand | 3M™ |
| Maximum Sale Quantity | 6 |
| Maximum Sale Day | 7 |
| Applicable Materials | Bare Metal |
| Composition | 15 to 40% Limestone, 10 to 30% Inorganic Filler 2, 10 to 30% Silyl Terminated Polyether, 5 to 10% Non-Phthalate Plasticizer, 3 to 7% Calcium Carbonate, 1 to 5% Dibutyl Phthalate, 1 to 5% Hydrocarbons, C11-C12, isoalkanes, <2% aromatics, 1 to 5% N-Ethyl-P-Toluenesulfonamide, 1 to 5% Inorganic Filler 1, 0.1 to 2% Stearic Acid, 0.5 to 1.5% N-Me 2-Pryrrolidone, < 1% 1,2-Ethanediamine, N1-[3-(trimethoxysilyl)propyl], < 0.5% Quartz Silica |
| Application Time | 5 to 10 min |
| Paintable (Y/N) | Yes |
| Specific Gravity | 1.4 to 1.6 |
| Sprayable (Y/N) | Yes |
| Color | Gray |
| Flash Point | 144 deg F |
| Container Size (oz) | 10.5 |
| Container Type | Cartridge |
| Form | Paste |
| Temperature Rating (deg F) | -20 to 200 |
| 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 Primed Surface. 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 10.5 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 8374. Use this number when cross-referencing against TDS, SDS, or legacy supplier catalogs.
Documents & Safety
DANGER: This seam sealer contains chemicals that can cause serious health effects including cancer, reproductive harm, and organ damage. May cause severe eye damage and skin irritation. Required PPE: safety glasses or goggles, chemical-resistant gloves, protective clothing, and respiratory protection in poorly ventilated areas. Avoid breathing vapors and prevent skin/eye contact. Can be harmful if swallowed or inhaled. 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 Primed Surface. 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 10.5 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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