SEM
SEM Dual-Mix 39377 2-Component Seam Sealer 7 oz Dark Gray Cartridge
No reviews yet
Hazardous material · Liquid
Liquid hazmat ships ground-only via UPS/FedEx with a per-item carrier surcharge applied 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: Cancer and Reproductive Harm
Tap for details → P65Warnings.ca.gov
Authorized dealer
Ships today
30-day returns
Overview
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™ 39377 is a 2‑component liquid seam sealer supplied in a 7 oz cartridge, formulated for rapid repair of seams on automotive panels. It is designed for use on a wide range of substrates including aluminum, steel, bare metal, e‑coat, fiberglass, OEM plastics, primer, and SMC, making it suitable for most body‑shop applications.
The system provides a 60‑minute work time and reaches sandable condition in 15 minutes, allowing efficient feather‑feathering before final cure. Full cure is achieved in 48 hours at 70 °F, and the formulation is zero‑VOC, reducing environmental impact and compliance concerns. Coverage is optimized for dark‑gray finish matching typical panel colors.
Due to its acute toxicity, skin corrosion, eye damage, and respiratory hazards, appropriate personal protective equipment is required: chemical‑resistant gloves, eye protection, protective clothing, and a respirator in well‑ventilated areas. Follow H302, H315, H317, H319, H335, and H351 safety statements during handling.
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 all contaminants, loose material, and ensure the surface is dry.
- Mix the two components of Dual‑Mix™ 39377 according to the manufacturer’s instructions, blending until a uniform consistency is achieved.
- Apply the seam sealer to the prepared joint. Work within the 60‑minute work window; the material remains sandable after approximately 15 minutes.
- After the sandable time, sand the cured seam as needed, then allow the repair to fully cure for 48 hours before final finishing.
Compatibility
Compatible substrates: Bare Metal, Primed Surface.
Compatible paint systems: Epoxy.
Specifications
| Part No. | 39377 |
|---|---|
| Product Line | SEM |
| MFR Model | 39377 |
| 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 | 646786393778 |
| 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 <5% 2,4,6-tris(dimethylaminomethyl)phenol, 1 to 1.5% 1,3 to Bis(2,3-epoxypropoxy)-2,2-dimethylpropane, >=0.1 to <1% Castor Oil Glycidal Ether, >=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 | Amine |
| Color | Dark Gray |
| Setting Time | 15 min at 70 deg F |
| Flash Point | 257 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
- 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™ 39377 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 handling this product?
Use eye protection, chemical‑resistant gloves, protective clothing, and a respirator as recommended in the SDS.
Can I sand or paint over the sealer, and when?
Sandability begins after 15 minutes; you can sand and then paint once the material has reached its sandable state and fully cured (48 hours).
Documents & Safety
Danger. Wear safety glasses, chemical‑resistant gloves, protective clothing and a respirator when handling this product. It is toxic if inhaled or swallowed, can cause severe skin burns and eye injury, may be carcinogenic, and is harmful to aquatic life. Use adequate ventilation and avoid any skin or eye contact. 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
SEM is compatible with Bare Metal, 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 SEM is 1 hr at 70 deg F. 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 SEM in a 7 container. Check the autofxmart catalog for other sizes and bulk pricing.
Most in-stock orders for SEM 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 SEM 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 Our Customers Say
Thanks! Your review was submitted and will appear after moderation.
No reviews yet — be the first to review this product.
