Built for the job.
Dual-Mix™ Seam sealer is a medium viscosity, two-component, epoxy sealer for sealing interior or exterior seams, joints and voids.
Dual-Mix™ 39477 is a two-component liquid seam sealer supplied in a 7 oz cartridge, formulated for high-performance sealing of panel joints and weld seams on automotive bodies. It is designed for use on a broad range of substrates including aluminum, steel, bare metal, e-coat, fiberglass, OEM plastics, primer, and SMC.
The formulation offers a 60-minute work time with flash at 70 °F, allowing ample placement before the sandable window opens at 15 minutes. Full cure is achieved in 48 hours, providing a durable, zero-VOC bond that meets stringent emissions requirements. The product’s exceptional impact resistance ensures long-term seam integrity under dynamic loads.
Due to its classification as acute toxicity, carcinogenic, and skin corrosive, handling requires eye protection, chemical-resistant gloves, protective clothing, and a respirator in well-ventilated areas. Follow H302, H315, H317, H319, H335, and H351 precautions and refer to the SDS for first-aid procedures.
Why Pros Choose SEM 2-Component
- Dual-Mix™ forever warranty
- OEM recommended
- Direct to metal
- Paintable immediately
- Will not shrink, harden or crack
- Non-sag formula duplicates OEM sealers
- Fast cure increases production
- Sprayable for additional versatility
- Excellent adhesion to bare metal or primed surfaces
How to Use
For use on bare metal, OEM finish, epoxy primer and DTM urethane primer
- Clean the substrate thoroughly-remove dust, oil, rust, and loose material. Ensure the surface is dry.
- Combine the two components in a clean mixing cup. Mix until uniform; the mixed material remains workable for up to 60 min (pot life).
- Apply a thin, even coat with a brush or spray gun. Allow the seam sealer to become sandable (≈15 min) before sanding.
- If additional coverage is required, apply a second coat after sanding the first layer. Maintain the same 15-minute sandable window.
- Let the final coat cure for 48 hr at ambient temperature (70 °F). No VOC emissions; cleanup can be performed with water while the material remains within its pot life.
Compatibility
Compatible substrates: Bare Metal, Primed Surface.
Compatible paint systems: Epoxy.
Specifications
| Part No. | 39477 |
|---|---|
| Product Line | SEM |
| MFR Model | 39477 |
| Standard/Approvals | GHS07 | GHS08 | OSHA HCS Hazard | OEM Approved | California PROP65 Warning: Cancer and Reproductive Harm |
| Application | For use on bare metal, OEM finish, epoxy primer and DTM urethane primer |
| Manufacturer | SEM |
| UPC | 646786394775 |
| Brand | Dual-Mix™ |
| Maximum Sale Quantity | 6 |
| Maximum Sale Day | 7 |
| Applicable Materials | Bare Metal, Epoxy Primer, DTM Urethane Primer |
| Composition | 30 to 40% Bisphenola(chloro)oxirane Polymer, 5 to 7% Fumed Silica, 1.5 to 5% Epoxy Resin, 1.5 to 5% Modified Diglycidal Ether,>=1.5 to =0.1 to =0.1 to <1% [3-(2,3-epoxypropoxy)propyl]trimethoxysilane |
| Application Time | 10 min at 70 deg F |
| Paintable (Y/N) | Yes |
| Sprayable (Y/N) | Yes |
| Odor/Scent | Characteristic |
| Color | Beige |
| Setting Time | 15 min at 70 deg F |
| Flash Point | 249 deg C |
| Container Size (oz) | 7 |
| Container Type | Cartridge |
| Form | Liquid |
| Temperature Rating (deg F) | 70 |
| Type | 2-Component |
| Curing Time | 1 hr at 70 deg F |
- Cure Time
- 48 hr
- Sandable Time
- 15 min
- Work Time
- 60 min
- VOC
- Zero VOC
- Compatible Substrates
- Aluminum, bare metal, e-coat, fiberglass, OEM, plastic, primer, SMC, steel
About SEM
SEM Products specializes in paint adhesion systems, flexible coatings, and plastic repair — the go-to choice for interior and trim refinishing.
Frequently Asked Questions
What substrates can Dual-Mix™ 39477 be applied to?
It is compatible with aluminum, bare metal, e-coat, fiberglass, OEM plastic, primer, SMC and steel.
How long does the seam sealer take to cure?
The full cure time is 48 hours at 70 °F (21 °C).
What personal protective equipment is required when using this product?
Wear eye protection, chemical-resistant gloves, protective clothing and a respirator as indicated on the SDS.
Can I sand or paint over Dual-Mix™ 39477, and if so when?
The material becomes sandable after approximately 15 minutes and can be painted once fully cured (48 hours).
Documents & Safety
- Safety Data Sheet (SDS)
- dualmix_39337_catalog.pdf
- 39477%20Beige%20Seam%20SealerUSA.pdf
Danger – This two-component seam sealer contains chemicals that are toxic if inhaled or swallowed, may cause skin burns and serious eye damage, and is classified as a carcinogen and aquatic toxin. Wear chemical-resistant gloves, safety goggles or face shield, protective clothing (coveralls), and use a suitable respirator when mixing or applying. Avoid breathing vapors, prevent contact with skin and eyes, and keep the product away from water 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 [email protected].
