3M
3M 58308 Heavy Bodied Seam Sealer 600 mL Off-White/Black Paste Cartridge
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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
This product can expose you to chemicals known to the State of California to cause cancer and reproductive harm.Tap for details → P65Warnings.ca.gov
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Overview
Built for the job.
Our 3M™ heavy bodied seam sealer is a two-part epoxy seam sealer for all general-purpose automotive sealing. It cures quickly to a tough, strong bead for lasting seam sealing protection and is used on door skins, floor pans, trunk floors, roof seams and many other applications. Our self-mixing system ensures a proper…
Why Pros Choose 3M 2-Part
- High performance two-part epoxy seals vertical and horizontal seams to match OEM seals
- Metered mixing with dual syringe cartridge eliminates the difficulty and mess of manual mixing
- Non-flowing, heavy bodied formula allows easy tooling for matching OEM seam sealer appearances
- Quick cure time and non-sag property aids during vertical applications
- Heavy bodied, non-sagging, non-flowing, and easy tooling formulation for matching OEM seam sealer appearances
- Appropriate for bare metal applications
- Black in color, 6 min work time
How to Use
For general-purpose automotive sealing needs that cures quickly to a tough, strong bead, lasting seam sealing protection and bare metal, door hem flanges, drip moldings, exterior seams and joints, joint filling, overlapping sheet metal
Compatibility
Compatible substrates: Bare Metal, Epoxy Primer.
Compatible paint systems: Urethane, Epoxy, 2K.
Specifications
| Part No. | 58308 |
|---|---|
| Product Line | MMM |
| MFR Model | 58308 |
| Application | For general-purpose automotive sealing needs that cures quickly to a tough, strong bead, lasting seam sealing protection and bare metal, door hem flanges, drip moldings, exterior seams and joints, joint filling, overlapping sheet metal |
| Manufacturer | 3M Products |
| Alternate Part Number-1 | 60455054845 |
| UPC | 076308583088 |
| Brand | 3M™ |
| Composition | 60 to 100% Mercaptan-Terminated Epoxy Curing Agent NJ 800938-5952, 7 to 13% Proprietary Polyamine-Polymercaptan Blend NJTSR# -6794855320P; 6794855321P; 6794855322P; 6794855323P, 3 to 7% Dimethyl Siloxane, Reaction Product with Silica (Part A)/60 to 80% EPOXY RESIN, 10 to 30% Epoxy Resin, 3 to 7% Dimethyl Siloxane, Reaction Product with Silica, 0.5 to 1.5% Carbon Black, <0.005% Diglycidyl Ether (Part B) |
| Application Time | 6 min |
| Paintable (Y/N) | Yes |
| Specific Gravity | 1.18 (Part A), 1.16 (Part B) |
| Base Type | Epoxy |
| Component | 2K |
| Odor/Scent | Mercaptan (Part A), Epoxy (Part B) |
| Color | Off-White (Part A), Black (Part B) |
| Container Size (mL) | 600 |
| Flash Point | >200 deg F |
| Container Type | Cartridge |
| Form | Paste |
| Temperature Rating (deg F) | -20 to 180 |
| Type | 2-Part |
| Curing Time | 60 min |
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, Epoxy Primer. 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 60 min. 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 600 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 58308. Use this number when cross-referencing against TDS, SDS, or legacy supplier catalogs.
Documents & Safety
Warning: This seam sealer contains materials that may cause cancer and is flammable. Required safety equipment includes eye protection, protective clothing, and respiratory protection. Product may cause severe irritation to skin, eyes, and respiratory tract if exposed. Ingestion may cause stomach upset and abdominal pain. 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.
Specifications
Full data
Frequently asked
Good to know
3M Products MMM is compatible with Bare Metal, Epoxy Primer. 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 60 min. 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 600 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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