Overview
Built for the job.
3M™ SMC/Fiberglass repair adhesives are two-part urethanes or two-part epoxies used to bond backup strips to SMC (sheet molded compound), FRP (traditional fiberglass) and primed metal. Our adhesives provide a full range of hardness, flexibility and worktimes for jobs such as reinforcing the backside of plastic…
3M 08274 is a two-part, viscous liquid repair adhesive supplied in a 400 mL dual cartridge. It is designed for structural repairs and filler applications where high strength and durability are required, such as panel bonding, spot welding reinforcement, and filling deep gouges.
The formulation provides a work time of 20 minutes and a sandable window of up to 4 hours, allowing ample handling before finishing. VOC content is measured at 816 g/L (6.8 lb/gal). It bonds to a broad range of substrates including ABS, aluminum, bare metal, e-coat, fiberglass, FRP, galvanized steel, plastic, polyester, SMC and standard steel, making it suitable for most body shop projects.
Use in a well-ventilated area with appropriate PPE: safety glasses or face shield, chemical-resistant gloves, protective clothing, and a respirator as required by the SDS. The adhesive has a flash point of 110 °C (closed cup) and carries acute toxicity, aspiration hazard, carcinogenicity, eye damage, organ toxicity, oxidizer, reproductive and respiratory hazards.
Why Pros Choose 3M 2-Part
- Two-part urethane or two-part epoxy adhesives effectively bond rigid plastic
- Commonly used to bond backup strips to SMC and FRP (traditional fiberglass)
- Frequently used for backside reinforcement repair on a variety of plastic components
- Adhesive offers excellent sag resistance
- A range of work times allows for maximum efficiency on specific jobs
- A high-performance two component urethane adhesive with excellent sag resistance
How to Use
For backside reinforcement repair on a variety of plastic components
- Clean the substrate and remove all contaminants; ensure surfaces such as ABS, aluminum, bare metal, e-coat, fiberglass, FRP, galvanized steel, plastic, polyester, SMC, or steel are dry and free of oil, grease, and loose material.
- Mix the two parts in a 1:1 ratio by weight. After mixing, the adhesive has a work time (pot life) of approximately 20 minutes.
- Apply the mixed adhesive with a brush or spatula to the prepared area. Build up as needed; multiple coats may be applied after the previous coat reaches sandable condition.
- Allow each coat to become sandable for up to 4 hours before sanding or applying additional layers.
Compatibility
Compatible substrates: Fiberglass, Plastic, SMC.
Compatible paint systems: Urethane, Epoxy.
Specifications
| Part No. | 8274 |
|---|---|
| Product Line | MMA |
| MFR Model | 8274 |
| Standard/Approvals | California PROP65 Warning: Cancer and Reproductive Harm | OSHA 29 CFR 1910.1200 |
| Application | For backside reinforcement repair on a variety of plastic components |
| Manufacturer | 3M Products |
| Alternate Part Number-1 | 60455051197 |
| UPC | 051135082744 |
| Brand | 3M™ |
| Maximum Sale Quantity | 6 |
| Maximum Sale Day | 7 |
| Applicable Materials | SMC/Fiberglass, Primed Metal |
| Composition | 30 to 60% 4,4'-Isopropylidenediphenol-Epichlorohydrin Polymer, 10 to 30% Oxide Glass Chemicals, 15 to 40% Talc, 7 to 13% 1,4-Bis[(2,3-Epoxypropoxy)Methyl]Cyclohexane, 7 to 13% Fused Silica, 1 to 11% Acrylate Polymer, 1 to 5% Silica |
| Application Time | 90 min |
| Specific Gravity | 1.2 |
| Color | Black |
| Container Size (mL) | 400 |
| Setting Time | 4 hr |
| Flash Point | >=220 deg F |
| Container Type | Cartridge |
| Form | Viscous Liquid |
| Type | 2-Part |
| Curing Time | 24 hr |
- Work Time
- 20 min
- Sandable Time
- 4 hr
- VOC
- 816 g/L (6.8 lb/gal)
- Compatible Substrates
- ABS, aluminum, bare metal, e-coat, fiberglass, FRP, galvanized, plastic, polyester, SMC, steel
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 substrates can I bond with 3M 08274 Repair Adhesive?
The adhesive is compatible with ABS, aluminum, bare metal, e-coat, fiberglass, FRP, galvanized steel, plastic, polyester, SMC and standard carbon or stainless steel.
How much working time do I have after mixing?
The mixed adhesive provides a work (open) time of 20 minutes before it begins to set.
When can I sand the repaired area?
Sanding is recommended after the material has reached its sandable stage, which occurs at approximately 4 hours post-application.
What personal protective equipment is required when using this product?
Use eye protection, chemical-resistant gloves, protective clothing and a respirator approved for organic vapors. The material is classified with acute toxicity, aspiration hazard, carcinogenicity, eye damage, organ toxicity, oxidizer, reproductive and respiratory hazards.
Is the adhesive flammable?
The flash point is 110 °C (closed-cup test), indicating it is not readily flammable under normal shop conditions.
Documents & Safety
DANGER: This adhesive contains hazardous chemicals that can cause serious health effects including cancer, reproductive harm, and organ damage. Required PPE: safety glasses, chemical-resistant gloves, protective clothing, and respirator. Potential hazards include skin and eye burns, respiratory irritation, and toxic effects if inhaled or ingested. Flash point 110°C. Keep away from heat and ignition sources. 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 MMA is compatible with Fiberglass, Plastic, SMC. 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 MMA 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 MMA in a 400 container. Check the autofxmart catalog for other sizes and bulk pricing.
Most in-stock orders for 3M Products MMA 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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